[[caption-width-right:300:[-"Each man of you finds Sunday quite different, yet each man of you can only find one thing to compare him to -- the universe itself."-] ]]
->"''First of all, what is it really all about? What is it you object to? You want to abolish Government?''"\\
"''To abolish God!" said Gregory, opening the eyes of [[KnightTemplar a fanatic]]. "We do not only want to upset a few despotisms and police regulations; that sort of anarchism does exist, but it is a mere branch of the Nonconformists. We dig deeper and we blow you higher. We wish to [[AboveGoodAndEvil deny all those arbitrary distinctions of vice and virtue, honour and treachery]], upon which mere rebels base themselves. The silly sentimentalists of UsefulNotes/TheFrenchRevolution talked of the Rights of Man! We hate Rights as we hate Wrongs. We have abolished Right and Wrong.''"\\
"''And Right and Left," said Syme with a simple eagerness, "I hope you will abolish them too. They are much more troublesome to me.''"

''The Man Who Was Thursday: A Nightmare'' is a metaphysical {{thriller}} by famed author Creator/GKChesterton, and stands alongside his ''Literature/FatherBrown'' stories as his most famous work.

The story concerns special detective [[WarriorPoet Gabriel Syme]], a member of a secret police force dedicated to fighting the forces of Anarchy, who encounters a self-professed anarchist poet by the name of Lucian Gregory. After a spirited debate on the subject of OrderVersusChaos, Gregory invites Syme to a secret meeting of the anarchist force to which he belongs. There, Syme manages to get himself elected as the new Thursday on the anarchists' supreme council, the Council of Days, [[DayOfTheWeekName where each member is named for a different day of the week]], [[TheInfiltration in order to penetrate the anarchist organization and bring it down]]. The council is led by the terrifyingly cheerful and enigmatic figure of Sunday, and what follows is Syme's attempt to stay sane in the face of what seems to be true evil, and to answer the maddening question: "Who is Sunday?"

The book deals with the conflict of Order and Chaos, and serves to deconstruct the concept of the BombThrowingAnarchist (which was popular at the time) in favour of dealing with philosophical anarchism, that Chesterton felt to be actual nihilism that seeks to abolish not just government and authority, but the very concepts of good, evil, and God. It contains elements of the spy novel, MysteryFiction, {{satire}}, MagicalRealism, humour, and horror, and has also had a rather eclectic variety of fans in the literary world, including Michael Collins, Creator/JorgeLuisBorges, and Creator/FranzKafka.

An adaptation starring Creator/FrancoisArnaud, Creator/AnaUlaru, and Creator/JordiMolia was released in 2016 to critical acclaim.

You can read it online [[http://www.ccel.org/ccel/chesterton/thursday.ii.html here]].
!!The novel contains examples of:
* AffablyEvil: Sunday has his moments.
--> "Now listen to me. I like you. The consequence is that it would annoy me for just about two and a half minutes if I heard that you had died in torments. Well, if you ever tell the police or any human soul about us, I shall have that two and a half minutes of discomfort. On your discomfort I will not dwell. Good-day. Mind the step."
* AllJustADream: No, that's not a spoiler; it's right there in the subtitle. Chesterton actually wrote an article [[TakeThat specifically criticizing the readers and critics who overlooked that in their interpretations of the work]]. To be fair, it's not totally clear given that the protagonist "wakes" to find himself walking and in the middle of a conversation. But again, [[ExactlyWhatItSaysOnTheTin it's right in the damn title.]]
* AnarchyIsChaos: The anarchists ''themselves'' take this position, as exemplified in the page quote. It's pointed out that there is a distinction between a revolutionary who throws a bomb to kill a king, and an anarchist who throws a bomb to kill ''anybody''. Though, in fairness, [[spoiler:it turns out that none of them are actually anarchists except Gregory.]]
* AlternateCharacterInterpretation: In-Universe example: Almost a whole chapter is dedicated to each Council member's different interpretation of Sunday.
* BadassBoast: Sunday gives one before revealing [[spoiler:he is the man in the dark room.]]
* BeautyEqualsGoodness: Good characters look wholesome, evil characters look creepy in some way--and seeing what a character ''really'' looks like is enough to convince the other characters what side he's really on. But many characters are wearing some form of disguise. The beauty that marks their goodness is subsurface.
* BeneathNotice: Subverted; Sunday's method of keeping the anarchists away from suspicion [[SarcasticConfession is for them to claim explicitly to be]] BombThrowingAnarchists, while appearing to be (eccentric) respectable gentlemen.
* {{Bizarrchitecture}}: Saffron Park (based on the real Bedford Park), as well as the homes of Monday and Sunday.
* BlueBlood: A recurring theme of the novel is that the working/lower class, even criminals, will never be swayed into philosophical anarchy, only the rich/upper class and intellectuals. [[spoiler:It appears to be subverted in a big way later in the novel, but is actually played straight.]]
* BombThrowingAnarchist: Deconstructed.
* BoredWithInsanity: Syme embraced Order and rejected radicalism because his whole family was made up of radicals for various causes and ideologies.
-->Being surrounded with every conceivable kind of revolt from infancy, Gabriel had to revolt into something, so he revolted into the only thing left -- sanity.
* CarChase: No, seriously. Since this was published in 1908, it might well be the UrExample.
* CatapultNightmare: Averted, and [[LampshadeHanging lampshaded]] in the process.
* CloudCuckoolander: Syme.
* ColdBloodedTorture: Tuesday is threatened with this.
* ComicBookAdaptation: A webcomic, actually: ''WebComic/LittleTales'' intersperses an adapted version between its usual SliceOfLife strips.
* CostumePorn: The masquerade costumes in the last chapter -- not done in excruciating detail, though.
* CrazySane: Syme.
* DayOfTheWeekName: Naturally. Though in a slight aversion, the weekday names are actually code names (with the possible exception of Sunday) for the seven leaders of an anarchist organization. [[spoiler:In another aversion, they turn out to be based on the days of the Creation week, slightly adjusted.]]
* DeadpanSnarker: Syme and Wednesday/[[spoiler:Rickert]] especially, though all the characters have their moments.
* DidWeJustHaveTeaWithCthulhu
* DressCodedForYourConvenience: At the climax of the story, each Council member is dressed in clothes featuring a motif based on what was created on his respective day in [[Literature/TheBible Genesis]]: Monday has a single white stripe for the light created on the first day; Tuesday, blue parted robes; Wednesday, a tree/green motif; Thursday, the sun and moon; Friday, fish and birds, and Saturday, beasts and a man. [[spoiler:In addition, Sunday is in all white robes, and Gregory in all black.]]
** Sunday encourages the members of his organization to dress the part of the stereotypical morning-coated, top hat-wearing gentleman, an aversion of the stereotypical caricature of the BombThrowingAnarchist. However:
*** This is subverted by [[spoiler:Tuesday]], who normally ''does'' dress as the caricature and is uncomfortable in gentleman's clothes, and ''doubly'' subverted when that costume is revealed to be itself an assumed role.
*** More profoundly, it is subverted by the explicit statement that the real anarchists are the rich aristocrats, the sort of men who ''do'' wear top hats and evening dress.
*** Subverted again late in the novel, during the chapter "The Earth In Anarchy".
*** And ''again'' when it's revealed that [[spoiler:nobody was actually an anarchist, but were only trying to nab the people who they thought were anarchists - who also weren't anarchists.]]
* DuelToTheDeath: Syme [[HitMeDammit intentionally provokes one with the Marquis de St. Eustache]] to prevent him from getting to Paris to carry out an assassination. [[spoiler:(It's not actually to the death, though.)]]
* EvilRedhead: Gregory. But ''not'' [[HeroesWantRedheads his equally redheaded sister, Rosamond]].
--> "My red hair, like red flames, shall burn up the world ... "
* EvilVirtues: Discussed as the difference between an ordinary criminal and a BombThrowingAnarchist.
--> "Thieves respect property. They merely wish the property to become their property that they may more perfectly respect it."
* FlockOfWolves: Used to the point of hilarity, as well as one the novel's major twists.
* GainaxEnding: The whole thing takes a major turn for the surreal, right before the protagonist wakes up from his dream. Which he somehow had while walking, in the midst of a conversation.
* GenderLift: Dr. "Saturday" Bell, a male, was played by female Creator/AnaUlaru in the film adaptation.
* GenteelInterbellumSetting
* {{God}}: No, Sunday is not He, though it was a popular interpretation. Chesterton {{Jossed}} this view by WordOfGod. Further WordOfGod on the subject, from two different articles:
-->"...I think you can take him to stand for Nature as distinguished from God. Huge, boisterous, full of vitality, dancing with a hundred legs, bright with the glare of the sun, and at first sight, somewhat regardless of us and our desires."
-->"But you will note that I hold that when the mask of Nature is lifted you find God behind."
* GoodColorsEvilColors: A character with red hair is ''almost'' always Good in Chesterton. Less frequently, blond hair is evil, especially if the blondness looks somehow artificial gilded. However, this novel subverts this with the honourable protagonist Syme (who is blond) and the antagonist(?) Gregory (maybe), who is red-haired.
** On the other hand, his sister, also red-haired, is unambiguously good -- and probably a tribute to Chesterton's own wife, Frances.
* HappyEnding: Or at least, it appears to be.
* HeroesWantRedheads: Syme is surprised, "but with a curious pleasure," to have Gregory's red-headed sister Rosamond for company after his debate.
* HiddenInPlainSight
* HonorBeforeReason: Why Gregory can't out Syme to the rest of the anarchist assembly and Syme won't go to the police with the whereabouts of the Council of Days, [[IGaveMyWord because each made the other swear he wouldn't]].
* TheInfiltration
* ItRunsInTheFamily
* LargeAndInCharge
* MasqueradeBall: ''See'' DressCodedForYourConvenience.
* MeaningfulName: Rosamond, whose name is derived from the Latin ''rosa mundi,'' or "Rose of the World," one of the many, ''[[IHaveManyNames many]]'' titles given to UsefulNotes/{{Jesus}}. Also, the titles for the members of the Council of Days.
* MindScrew: The story gets progressively Screwier as it goes on, and the ending takes the cake.
* MiseryPoker: Between Syme and Sunday at the end. [[spoiler:Sunday wins.]]
** Before that, one between Syme and Gregory, which [[spoiler:Syme wins.]]
* MistakenForAnImposter: [[spoiler:How Wilks got into the Council and the role of Professor De Worms/Friday.]]
* MocksteryTale: [[spoiler:There was really never any anarchist conspiracy, and the whole detective plot is just a framing device for a religious story.]]
* MoleInCharge: Syme finds himself in this role at first, but it's much more complicated than he expects.
* MotiveRant: [[spoiler:Gregory]] [[RageAgainstTheHeavens gives one at the climax of the book]]; it also doubles as a HannibalLecture.
* MundaneMadeAwesome: As part of his [[EstablishingCharacterMoment beginning rant]], Gregory attacks the train system, suggesting that the clerks look so dull because their lives are ordered. Symes then says:
--> "It is you who are unpoetical," replied the poet Syme. "If what you say of clerks is true, they can only be as prosaic as your poetry. The rare, strange thing is to hit the mark; the gross, obvious thing is to miss it. We feel it is epical when man with one wild arrow strikes a distant bird. Is it not also epical when man with one wild engine strikes a distant station? Chaos is dull; because in chaos the train might indeed go anywhere, to Baker Street or to Bagdad. But man is a magician, and his whole magic is in this, that he does say Victoria, and lo! it is Victoria. No, take your books of mere poetry and prose; let me read a time table, with tears of pride. Take your Byron, who commemorates the defeats of man; give me Bradshaw, who commemorates his victories. Give me Bradshaw, I say!"
-->"Must you go?" inquired Gregory sarcastically.
-->"I tell you," went on Syme with passion, "that every time a train comes in I feel that it has broken past batteries of besiegers, and that man has won a battle against chaos. You say contemptuously that when one has left Sloane Square one must come to Victoria. I say that one might do a thousand things instead, and that whenever I really come there I have the sense of hairbreadth escape. And when I hear the guard shout out the word 'Victoria,' it is not an unmeaning word. It is to me the cry of a herald announcing conquest. It is to me indeed 'Victoria'; it is the victory of Adam."
* MutualMasquerade: The secret police force is so secret that none of its agents knows the identity of any of its other agents.
* NietzscheWannabe: Professor De Worms, [[spoiler:or at least Wilks' impression of him.]]
* TheNounWhoVerbed: The title.
* OmniscientCouncilOfVagueness: The Anarchist council. [[spoiler:Subverted, as all the members save Sunday are policemen in disguise.]]
* TheOnlyBeliever: [[spoiler:Only Gregory is an actual anarchist, all the other members are police spies. When Gregory learns this he is ''not'' happy.]]
* PaperThinDisguise: See also TheWarOnStraw and [[SugarWiki/FunnyMoments Crowning Moment of Funny]]; Gregory's EpicFail attempts at undercover agent work.
* RefugeInAudacity: Syme's method of getting himself elected to as the new Thursday and baiting the Marquis/Wednesday into their DuelToTheDeath. See also BeneathNotice.
* TheReveal: [[spoiler:Sunday [[StealthMentor was both the leader of the Council of Days]] ''and'' [[TheFaceless the "man in the dark room".]] Also, [[FlockOfWolves all the members of the Council of Days were undercover policemen like Syme.]]]]
* ReverseMole: Syme [[spoiler:among others.]]
* RightHandVersusLeftHand
* [[spoiler:RunningBothSides: Sunday, as part of TheReveal.]]
* SinisterShades: Bull wears a pair of smoked spectacles that obscure his eyes to [[UncannyValley uncanny]] effect. [[spoiler:Without them, his friendly eyes give him away as an agent of law and order, rather than anarchy.]]
->''"Put him in a pair of smoked spectacles... and you give even that honest angel a visage that would make a child scream."''
* SourSupporter: [[spoiler:The Professor]] thinks that the task before them is impossible, but still will work on it.
* WallOfWeapons: The corridor leading to the assembly room in the underground anarchist HQ at the beginning of the book is covered with various pistols, rifles, and other weapons. The assembly room proper is lined with bombs.
* TheWarOnStraw: Gregory's explanation of his own failed attempts to go undercover:
--> "The history of the thing might amuse you," he said. "When first I became one of the New Anarchists I tried all kinds of respectable disguises. I dressed up as a bishop. I read up all about bishops in our anarchist pamphlets, in ''Superstition the Vampire'' and ''Priests of Prey''. I certainly understood from them that bishops are strange and terrible old men keeping a cruel secret from mankind. I was misinformed. When on my first appearing in episcopal gaiters in a drawing-room I cried out in a voice of thunder, 'Down! down! presumptuous human reason!' they found out in some way that I was not a bishop at all. I was nabbed at once. Then I made up as a millionaire; but I defended Capital with so much intelligence that a fool could see that I was quite poor. Then I tried being a major. Now I am a humanitarian myself, but I have, I hope, enough intellectual breadth to understand the position of those who, like Nietzsche, admire violence -- the proud, mad war of Nature and all that, you know. I threw myself into the major. I drew my sword and waved it constantly. I called out 'Blood!' abstractedly, like a man calling for wine. I often said, 'Let the weak perish; it is the Law.' Well, well, it seems majors don't do this. I was nabbed again."
* WarriorPoet: Syme is a poet, and, judging by his performance in his duel with the Marquis, something of a warrior.
* WeNeedADistraction: See DuelToTheDeath.
* WhiteSheep
* WitchHunt: A form of it is seen later in the novel when [[spoiler:the now-revealed-as-policemen Council members are pursued across the countryside by a mob of townspeople and men they thought were allies, led by the Secretary/Monday (who is also a policeman), who are under the mistaken impression that ''they'' are the anarchists. It gets cleared up by the end of the chapter, though.]]
* WordSaladHorror: Sunday leaves behind inexplicable messages to the members of the council -- messages that only make sense to the individuals for whom they are meant, thanks to the incredibly private information Sunday would have needed to know, and that frighten and enrage them for the same reason.
--> "The word, I fancy, should be 'pink'."\\
"What about Martin Tupper ''now?''"\\
"Fly at once. The truth about your trouser-stretchers is known. --A FRIEND."
* WorldOfCardboardSpeech: Syme gives one at the climax of the book; it also serves as a ShutUpHannibal to [[spoiler:Gregory's]] MotiveRant / HannibalLecture.