Jonathan Small, a prisoner serving a lengthy sentence on the Andaman Islands cuts a deal with two army officers, Major Sholto and Captain Morstan, in command of the prison. He reveals the location of a stash of loot in exchange for their help in helping him to escape from jail. The proceeds are to be split equally between the three of them.
The story takes place in 1913. Sherlock Holmes, virtually in retirement, is persuaded by Inspector Alec MacDonald of Scotland Yard to take on a baffling case. Three dead bodies have been found in London's East End, all with no discernible cause of death, but the expressions on their faces suggest that they all died in a state of terror.
The film begins during the German air raids in London in 1940. An elderly Dr. John Watson tells his nurse the tale of an unrecorded case he shared with his friend Sherlock Holmes. In 1882, Holmes and Watson investigate a ship carrying gold which was reportedly destroyed by a monstrous giant octopus on the coast of Newhaven. They do not believe the first-hand accounts of the sole survivor of the attack, but nonetheless investigate. Holmes is informed by Inspector Lestrade that he has recently had contact with Holmes's estranged brother Thorpe, a former partner of Lestrade's who was paralyzed during a bank robbery seven years prior.
The great detective Sherlock Holmes and his trusted companion Dr. John Watson travel to New York City to investigate a recent threat made by Professor Moriarty.
A British agent carrying a vital document is murdered on his way to deliver it in the USA. Holmes deduces he was carrying the document in the form of microfilm and goes to Washington with Watson to find the killer and retrieve the document before it falls into the hands of an "international spy ring". Before his death, the agent managed to pass the microfilm into the unwitting hands of a Washington debutante and bride-to-be. There are some amusing moments when the microfilm, which has been inserted into a "V for Victory" matchbook, gets passed from hand to hand at a party unknowingly, and at one point is discarded by the chief criminal. Holmes and Watson track down the criminals, rescue the bride-to-be and regain the microfilm.
The Baker Street Irregulars investigate as several of their members go missing, while also trying to prevent Sherlock Holmes — who is undergoing a personal crisis — being convicted of murder.
Dr. John H. Watson (Robert Duvall) becomes convinced that his friend Sherlock Holmes (Nicol Williamson) is delusional—particularly in his belief that Professor James Moriarty (Laurence Olivier) is a criminal mastermind—as a result of his addiction to cocaine. Indeed, Moriarty visits Watson to complain about being harassed by Holmes. Watson enlists the aid of Sherlock's brother, Mycroft (Charles Gray), to trick Holmes into traveling to Vienna, where he will be treated by Sigmund Freud (Alan Arkin). During the course of his treatment, Holmes investigates a kidnapping case with international implications, and Freud uncovers a dark personal secret suppressed in Holmes's subconscious.
Sherlock Holmes entre dans son salon et se rend compte qu'il a été cambriolé mais alors qu'il se confronte au bandit, ce dernier disparaît, à la grande surprise de Sherlock. Holmes tente d'oublier l'incident en allumant un cigare mais le voleur réapparaît et il tente alors de lui reprendre son butin en sortant un pistolet de son peignoir et en tirant sur l'intrus qui se volatilise. Une fois qu'Holmes récupère ce qui lui appartient, le sac disparaît de ses mains pour réaparaître dans les mains du voleur qui disparaît rapidement par une fenêtre. A ce moment précis, le film se termine inopinément sur l'image de Sherlock complètement déconcerté
Although it is based on Conan Doyle's characters, the story is an original one, which has the famous detective on the trail of Jack the Ripper. In the dark alleys of nineteenth century London, the notorious Jack the Ripper committed a series of gruesome murders. The story of A Study in Terror challenges Sherlock Holmes to solve these horrific crimes. This leads Holmes through a trail of aristocracy, blackmail, and family insanity. Unlike Scotland Yard, and the real-life story, Holmes exposes the identity of the Ripper.
Cambridge student Prince Alexis (Reginald Denny) is accused of stealing the athletic funds. Friend and fellow student Watson recommends he seek the assistance of classmate Sherlock Holmes. Meanwhile, while honing his observational skills out in the countryside, Holmes falls and is knocked unconscious. A young woman passerby, Alice Faulkner (Carol Dempster), comes to his aid, much to his delight.
Sherlock Holmes (Basil Rathbone) pretends to be a Nazi spy to aid scientist Dr. Franz Tobel (William Post Jr.) and his new invention, a bombsight, in escaping a Gestapo trap in Switzerland. Holmes and Franz fly to London, where Holmes places him under the protection of his friend, Dr. Watson (Nigel Bruce). The scientist slips away against Holmes' instructions for a secret reunion with his fiancee, Charlotte Eberli (Kaaren Verne), and gives her an envelope containing a coded message. He tells Charlotte to give it to Holmes if anything should happen to him. Leaving Charlotte's apartment, an attempt to abduct him by German spies is foiled by a passing London bobby.
A convicted thief in Dartmoor prison (played by an uncredited Cyril Delevanti) hides the location of stolen Bank of England printing plates inside three music boxes (each of which plays a subtly different version of "The Swagman"). The boxes are sold at a local auction house.
Consulting detective Sherlock Holmes fakes his own death in Scotland in order to investigate a number of bizarre apparent suicides that he is convinced are part of an elaborate plot by "a female Moriarty". Returning to his assistant Watson in secret, Holmes notes that all the victims were wealthy gamblers, so disguised as "Rajni Singh", a distinguished Indian officer, he stalks London's gaming clubs.
When several women are murdered and their forefingers severed, Holmes and Watson are called into action, but Holmes is baffled by the crimes at the start. Widower Sir George Fenwick (Paul Cavanagh), after a romantic night alone with his girlfriend Lydia Marlowe (Hillary Brooke), is hypnotized into believing that he is responsible for the crimes. He is certain that he is guilty after he awakes from a stupor and finds a woman's forefinger in his pocket. His daughter comes to Holmes and Watson without realizing that Moriarty's henchman is following her. She tells Holmes and Watson that she found her father burying a forefinger under a pile of soil. She has dug up the forefinger and shows it to them.
Holmes and Watson are in Canada attending a conference on the occult, when Lord Penrose receives a message that his wife Lady Penrose has been murdered in the small village of La Mort Rouge. Holmes and Watson are about to return to England when Holmes receives a telegram from Lady Penrose, issued before her death, asking for help as she fears for her life. Holmes decides to investigate her death.