When Inspector Lestrade consults Holmes about a murder, Holmes recognizes the name of the dead man and also of the step-father. Holmes quickly forms a theory about the murder, and sets out to prove it.
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A woman comes to consult Sherlock Holmes because her fiancé John has disappeared after he made an important discovery. Holmes investigates and finds a copy of a historical inscription that he then takes with him to Greystone Castle.
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A boy and his father are on a train, and after they have a fight, the boy seems to have vanished. Although his governess thinks he has simply run away, Holmes begins to suspect something a bit more serious.
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Sherlock Holmes helps one of Dr. Watson’s old friends by explaining the source of an odd noise in the man's home, but in doing so Holmes uncovers a more serious mystery.
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Sir Charles Farnsworth is found dead in his mysterious Farnsworth Castle. It turns out that Farnsworth had a clause inserted in this will that his death, no matter what the apparent cause, would be investigated by Sherlock Holmes.
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A condemned man scheduled to hang the next day uses his last request to ask Sherlock Holmes to prove his innocence of the murder for which he is about to be executed.
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