The Seven-Per-Cent Solution is a 1976 film directed by Herbert Ross and based on the novel of the same name by Nicholas Meyer. The film stars Nicol Williamson as Sherlock Holmes, Robert Duvall as Dr. Watson, and Alan Arkin as Sigmund Freud.
The film takes place in 1891, when Watson becomes concerned about Holmes' drug addiction and convinces him to travel to Vienna for treatment. There, Freud hypnotizes Holmes and helps him relive suppressed memories of a traumatic childhood experience that had led him to use cocaine to cope with his emotions.
Meanwhile, Holmes becomes embroiled in a mystery involving the kidnapping of Lola Deveraux, a beautiful actress with whom he had previously become infatuated. Holmes deduces that the kidnapper is connected to a powerful criminal organization and sets out to rescue Lola and bring the criminals to justice.
The Seven-Per-Cent Solution is notable for its depiction of the relationship between Holmes and Watson, as well as the portrayal of Freud and his theories. The film also features strong performances from its cast and a witty screenplay that blends humor and suspense.