A man known to be a mute is suspected of committing a murder, as he was noticed at the scene. However, witnesses saw and heard him talking as he was leaving the scene of the crime. The police must determine if he is the actual killer or if he is being framed.
In London, a secret society led by lawyer Thaddeus Merrydew collects the assets of any of its deceased members and divides them among the remaining members. Society members start dropping like flies. Sherlock Holmes is approached by member James Murphy's widow, who is miffed at being left penniless by her husband. When Captain Pyke is shot, Holmes keys in on his mysterious Chinese widow as well as the shady Merrydew. Other members keep dying: Malcom Dearing first, then Mr. Baker. There is also an attempt on the life of young Eileen Forrester, who became a reluctant society member upon the death of her father. Holmes' uncanny observations and insights are put to the test.
The heirs to a family fortune are required to attend a seance at the spooky old family mansion. However, throughout the night members of the family are being killed off one by one.
A phony spiritualist hypnotizes the daughter of a wealthy banker in a scheme to swindle the banker out of his money. A reporter investigating the swami discovers the plot, determines to expose it.
When a movie actor is shot and killed during production, the true feelings about the actor begin to surface. As the studio heads worry about negative publicity, one of the writers tags along as the killing is investigated and clues begin to surface.
Moriarty is sentenced to death, and Sherlock Holmes prepares to retire to the country and marry his girl. But Moriarty has sworn that Holmes, Lt. Col. Gore-King of Scotland Yard, and his trial judge shall all be hanged too. When Moriarty escapes and proceeds to put his threat into operation, Holmes has to postpone his retirement.
Thirteen years after a dinner party in which the thirteenth guest failed to arrive, the remaining guests are being murdered one by one, and their bodies being placed at the same dinner table in the appropriate seats they occupied thirteen years prior.
The Wrecker wrecks trains on the L & R Railroad. One of his victims is Larry Baker's father. Baker wants to find the evildoer, among a host of suspects, but it will be difficult since the Wrecker can disguise himself to look like almost anyone
A young woman turns to Holmes for protection when she's menaced by an escaped killer seeking missing treasure. However, when the woman is kidnapped, Holmes and Watson must penetrate the city's criminal underworld to find her.
A movie producer offers a nightclub singer a role in his latest film, but all he really wants to do is bed her. She knows, but accepts anyway. Meanwhile, a patron at the club gets a note saying that she'll soon get another note, and that she will be killed ten minutes after that.