History Literature / TheSevenPercentSolution

Creator/IDWComics adapted the novel into a miniseries in 2015.

* EpiphanyTherapy: Averted. It takes months for Sherlock to slowly return to normal.

* OedipusComplex: In their first meeting, Von Leinsdorf states that Freud's theories are that men should sleep with their mothers. This is, of course, a gross oversimplification of Freud's theories that a child's personality is influenced by their relationship with their parents.

* TheShrink: Freud is Type 3.

''The Seven-Per-Cent Solution'', published in 1974, is a novel-length ''Franchise/SherlockHolmes'' fic by Creator/NicholasMeyer. It's essentially a rewrite of Creator/ArthurConanDoyle's "The Final Problem" and "The Empty House", revealing that those stories (and the three-year [[TimeSkip "Great Hiatus"]] between them) were really a cover-up for Holmes' descent into drug addiction and recovery.

* AdaptationalVillainy: Moriarty is on the receiving end of this. [[spoiler:In the novel, Moriarty is merely the person who informs Sherlock of his mother's affair and death at her husband's hands. In the film, Moriarty actually is Mrs. Holmes' lover, and Sherlock sees him flee the scene after Squire Holmes shoots his wife dead, right in front of Moriarty and Sherlock. In the book Freud and Watson do suspect that Moriarty was more involved and guilty than he lets on, due to Mycroft's hold over him.]]

* AdaptationalVillainy: Moriarty is on the receiving end of this. [[spoiler:In the book, Moriarty is merely the person who informs Sherlock of his mother's affair and death at her husband's hands. In the film, Moriarty actually is Mrs. Holmes' lover, and Sherlock sees him flee the scene after Squire Holmes shoots his wife dead, right in front of Moriarty and Sherlock. In the book Freud and Watson do suspect that Moriarty was more involved and guilty than he lets on, due to Mycroft's hold over him.]]

Meyer wrote four sequels to the novel: 1976's ''The West End Horror'', which has Holmes interacting with the [[Creator/GilbertAndSullivan theatrical]] and [[Creator/GeorgeBernardShaw literary]] community of Victorian London while trying to solve a series of murders; 1993's ''The Canary Trainer'', in which he encounters [[Literature/ThePhantomOfTheOpera a certain spectral presence]] while anonymously playing violin in Paris between the events of the first two books; 2019's ''The Adventure of the Peculiar Protocols'', in which Holmes and Watson travel from London to Moscow in 1905 investigating an AncientConspiracy ; and 2021's ''The Return of the Pharaoh'' which takes Holmes and Watson to Egypt on the trail of a missing nobleman and the lost tomb of an Egyptian prince crossing paths with [[UsefulNotes/{{Tutankhamun}} Howard Carter.]]

* ValuesDissonance: Invoked: Writing the forward in 1939, Watson explicitly points out that at the time of the story's action, there was nothing illegal about Holmes obtaining and using cocaine, and that Watson himself certainly did not condone it or provide it for him.

Meyer wrote three sequels to the novel: 1976's ''The West End Horror'', which has Holmes interacting with the [[Creator/GilbertAndSullivan theatrical]] and [[Creator/GeorgeBernardShaw literary]] community of Victorian London while trying to solve a series of murders; 1993's ''The Canary Trainer'', in which he encounters [[Literature/ThePhantomOfTheOpera a certain spectral presence]] while anonymously playing violin in Paris between the events of the other two books; and 2019's ''The Adventure of the Peculiar Protocols'', in which Holmes and Watson travel from London to Moscow in 1905 investigating an AncientConspiracy.

* AvoidingTheGreatWar: The ultimate aim of the BigBad is to start gain control of the von Leinsdorf armaments companies, when von Leinsdorf had willed them to his wife, a Quaker (and thus, a pacifist) who would have converted them to peaceful uses. When they put an end to the plan, Holmes notes that they have only delayed the war, not prevented it entirely (and he's proven to be correct when World War I occurs).

The 1976 film version, with a screenplay by Meyer, was produced and directed by Herbert Ross, and featured Creator/AlanArkin (as Freud), Creator/VanessaRedgrave (as Lola Devereaux), Creator/RobertDuvall (as Watson), Creator/NicolWilliamson (as Holmes) and Creator/LaurenceOlivier (as Moriarty). It also featured Creator/CharlesGray as Mycroft, who would later reprise the role in the [[Series/SherlockHolmes Granada series]] with Creator/JeremyBrett.

Meyer wrote three sequels to the novel - 1976's ''The West End Horror'' (which has Holmes interact with [[Creator/GilbertAndSullivan the theatrical]] and [[Creator/GeorgeBernardShaw literary]] community of Victorian London while trying to solve a series of murders), 1993's ''The Canary Trainer'' (in which he encounters [[Literature/ThePhantomOfTheOpera a certain spectral presence]] while anonymously playing violin in Paris between the events of the other two books), and 2019's ''The Adventure of the Peculiar Protocols'', in which Holmes and Watson travel from London to Moscow in 1905 investigating an AncientConspiracy.

The 1976 film version, with a screenplay by Meyer, was produced and directed by Herbert Ross, and featured Creator/AlanArkin (as Freud), Creator/VanessaRedgrave (as Lola Devereaux), Creator/RobertDuvall (as Watson), Nicol Williamson (as Holmes) and Creator/LaurenceOlivier (as Moriarty). It also featured Creator/CharlesGray as Mycroft, who would later reprise the role in the [[Series/SherlockHolmes Granada series]] with Creator/JeremyBrett.

* SocietyMarchesOn: In the forward, written in 1939, Watson explains that, at the time of the novel's actions, there were no legal restrictions on the purchase and use of cocaine. He also mentions that he greatly resents people implying that he had condoned Holmes' addiction, or even provided the drug to him.

* HistoricalCharactersFictionalRelative: In the film adaptation, Sigmund Freud is given a son. He had one daughther in real life, who was included in the book, but she threatened to sue if her image was used in the film (she had no power over uses of her ''father's'' image, however).