Horace Vendig always gets what he wants. Even as a poor youth, he charmed his way into high society by getting the father of his friend, Martha, to foot the bill for his Harvard education. When Vic, another childhood pal, is invited to Horace's mansion for a party, he brings along Mallory Flagg, who happens to bear a striking resemblance to Martha. As Vic and Horace reunite, old resentments rise to the surface.

Holmes and Watson board a passenger train bound from London to Edinburgh, to guard the Star of Rhodesia, an enormous diamond worth a fortune belonging to an elderly woman of wealth; but within the first hour of the trip, the woman's son is murdered and the diamond stolen and any of the passengers in their car could be the killer thief.

In the midst of World War II, Sherlock Holmes rescues the Swiss inventor of a new bomb-sight from the Gestapo and brings him to England, where he quickly falls into the clutches of the evil Professor Moriarty.

In 1820s rural England, a young girl is tricked by tales of marriage from a villainous Squire. When she becomes pregnant and disappears, a gipsy lad is blamed.