Second book in the "John Cleaver" trilogy by Creator/DanWells, following ''Literature/IAmNotASerialKiller'' and followed by ''Literature/IDontWantToKillYou''

John Wayne Cleaver has always known he has a [[EnemyWithin dark side]], but he’s fought hard to repress it and live a normal life — separating John from Mr. Monster to survive. But after unleashing his [[IDidWhatIHadToDo dark side]] and destroying the vicious killer that was terrorizing his town, John's inner monster is getting stronger and harder to contain.

And now more bodies are being discovered...

As the police fail to catch Clayton County’s second serial killer, John is going to have to use his secret knowledge of the first demon-killer to trap the second... but will he be able to avoid suspicion falling on him, and, in the face of extreme horrors, will he be able to restrain Mr. Monster?
!! This book has examples of:
* AesopAmnesia - The school bully [[JerkJock Rob Anders]] [[MuggingTheMonster humiliated John one time too many]] in [[Literature/IAmNotASerialKiller the previous book]] and was threatened with evisceration, which thoroughly freaked him out. Wisely, he didn't mess with John for the rest of the novel, but by the start of ''Mr Monster'', Rob is back to his old jerkish ways. Seeing as John told Rob about his clinical sociopathy while threatening him, this crosses into BullyingADragon territory.
* AncientConspiracy - [[spoiler: Because just calling them demons is boring.]]
* BadAssBoast - John at the end of the book[[spoiler: while speaking to Nobody:]]
--> [[spoiler:Nobody: Hello Kanta. They're saying interesting things about you on the news, I wondered if you'd survived.]]
--> [[spoiler:John: He did. I killed him... I killed Mkhai too. Tens of thousands of years gone in the blink of an eye.]]
--> [[spoiler:Nobody: Why are you telling me this.]]
--> [[spoiler:John: Because you're next. I'm the demonslayer, come and get me.]]
* BoundAndGagged
* BoyMeetsGirl - John and Brooke.
* AChatWithSatan - John and the demon.
* CharacterDevelopment: John and his sociopathy both grow considerably in this book; "Mr. Monster" never gets as close to pushing John into becoming a killer than he does here, but John's confrontation with a ShadowArchetype allows his HeroicWillpower to completely conquer his dark side.
* CliffHanger - [[spoiler: The book ends with John phoning up a demon and telling her to come get him before he gets her.]]
* DrunkOnTheDarkSide - John uses this as a BatmanGambit against the demon, who can sense whatever he feels. He's just barely able to put it aside, and it still ruins one of his relationships.
* EasterEgg: John is studying ''Literature/{{Beowulf}}'' in English class. Much like how Grendel's mother stalks Beowulf after he kills Grendel, [[spoiler:Foreman]] is stalking John for killing Mhkai.
* ElectricTorture - There's a scene in the book devoted almost entirely to this.
* EmotionEater - [[spoiler: The demon has this power.]]
* HeroicWillpower - John is a sociopath, but he's also the protagonist. How? A whole lotta this trope.
* HumanoidAbomination: The main villain, [[spoiler:the Demon.]]
* IDidWhatIHadToDo - A big focus of this book is the fallout for John's psyche after he did what he had to do in the first book.
* IHaveYourWife - See also tropes such as AnOfferYouCantRefuse or InterrogationByVandalism.
* KickTheDog - Or, rather, [[{{Pyromaniac}} set fire to a cat]]
* {{Pyromaniac}} - John goes out and sets fires in order to let off steam when he's feeling pressure.
* ReluctantPsycho - John keeps himself 'normal' by not crossing certain lines. But sometimes you have to cross one of them in order to not cross another...
* ShipTease - John and Brooke's dates never end well.
* ShutUpHannibal
* ThePowerOfLove - John gives the demon a speech on this near the end, which is [[{{Sociopath}} odd, coming from him.]] [[spoiler: Although it was a ploy.]]
* TheyLookLikeUsNow
* ThisIsYourBrainOnEvil - John's entire struggle in life is with this darned trope.
** The demon in this story, too. Only this one has given up struggling and is enjoying every minute of it. Given how psychological the book is, the parallels shouldn't be surprising.
* TooCleverByHalf - John knows things about serial killers that even Detective Foreman doesn't know. [[spoiler: Which becomes a liability when said detective uses that very knowledge against him...]]
* WhatYouAreInTheDark: [[spoiler:The demon repeatedly confronts John with this situation and John even lampshades it, pointing out that he's almost certainly going to die soon anyway so he might as well live out his sick fantasies. John always manages to pull himself together however, more out of a desire to stick it to the demon than any of his own moral qualms.]]
* UnspokenPlanGuarantee: [[spoiler: Inverted. John explains pretty much exactly what his plan is to kill Forman with the electrified knife. The plan goes off almost without a hitch and the only significant unforeseen event actually makes the plan easier to pull off.]]