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Murder by Decree

Murder by Decree is a 1979 British-Canadian mystery thriller film directed by Bob Clark. It features the Sherlock Holmes and Dr. John Watson characters created by Sir Arthur Conan Doyle, who are embroiled in the investigation surrounding the real-life 1888 Whitechapel murders committed by "Jack the Ripper". Christopher Plummer plays Holmes and James Mason plays Watson. Though it features a similar premise, it is somewhat different in tone and result to A Study in Terror. It is loosely based on The Ripper File by Elwyn Jones and John Lloyd.

Plot

After the Metropolitan Police fail to apprehend the serial killer Jack the Ripper, Sherlock Holmes is approached to investigate the recent murders of prostitutes that happened in the Whitechapel district of London. Helped by Dr. Watson and the medium Robert Lees, Holmes discovers that all the victims were companions of Annie Crook, a woman locked in a mental institution.