Having once again avoided criminal conviction, Professor Moriarity develops a murderous plan to “finish off” his last major nemesis, Sherlock Holmes, by making him fail to prevent the perfect crime. Does it involve a family curse, the crown jewels of England, or something else…
The Good Comrades are a collection of varied gentlemen who crave one thing - solitude. They reside at Drearcliff House, ancestral home of their eldest member. All seems serene and convivial until one by one the members begin to perish in the most grisly of manners. Foul play is suspected by the Good Comrades' insurance agent, who turns to Sherlock Holmes and Dr. John Watson for guidance.
During WWII several murders occur at a convalescent home where Dr. Watson has volunteered his services. He summons Holmes for help and the master detective proceeds to solve the crime from a long list of suspects including the owners of the home, the staff and the patients recovering there.
The famous Borgia Pearl, a valuable gem with a history of bringing murder and misfortune to its owner since the days of the Borgias, is brought to London, thanks in part to Sherlock Holmes. But before long the jewel is stolen, due to an error on Holmes' part, and shortly thereafter, a series of horrible murders begin, the murderer leaving his victims with their spines snapped and surrounded by a mass of smashed china.
On his uncle's death Sir Henry Baskerville returns from Canada to take charge of his ancestral hall on the desolate moors of Devonshire, and finds that Sherlock Holmes is there to investigate the local belief that his uncle was killed by a monster hound that has roamed the moors since 1650, and is likely to strike again at Sir Henry.
When a woman is found dead with her throat torn out, the local villagers blame a supernatural monster. But Sherlock Holmes, who gets drawn into the case from nearby Quebec, suspects a human murderer.
Spade and Archer is the name of a San Francisco detective agency. That's for Sam Spade and Miles Archer. The two men are partners, but Sam doesn't like Miles much. A knockout, who goes by the name of Miss Wanderly, walks into their office; and by that night everything's changed. Miles is dead. And so is a man named Floyd Thursby. It seems Miss Wanderly is surrounded by dangerous men. There's Joel Cairo, who uses gardenia-scented calling cards. There's Kasper Gutman, with his enormous girth and feigned civility. Her only hope of protection comes from Sam, who is suspected by the police of one or the other murder. More murders are yet to come.
A bored young woman, a teen living in Santa Rosa, California, Charlotte \Charlie\ Newton (Wright), is frustrated because nothing seems to be happening in her life and that of her family. Then, she receives wonderful news: her uncle (for whom she was named), Charlie Oakley (Cotten), is arriving for a visit. But Uncle Charlie may not be the man he seems to be.
Unsuspecting Mr. Dietrichson becomes increasingly accident prone after his icily calculating wife encourages him to sign a double indemnity policy proposed by a smooth-talking insurance agent. Against a backdrop of distinctly California settings, the partners in crime plan the perfect murder to collect the insurance. Perfect until a claims manager gets a familiar feeling of foul play and pursues the matter relentlessly.
Starting in Switzerland, Sherlock Holmes rescues the inventor of a bomb-sight which the allies want to keep from the Nazis. Back in London it seems that the inventor is not all that he seemed.
The town's leading citizen is a man victim of homicidal impulses beyond his control. He is being controlled by his wife who had left him for another man. She was involved in a car accident that has left her brain damaged and is kept in the basement, in secret, by Kessler's gardener.
After World War I, Armistice Lloyd Hart goes back to practice law, former saloon keeper George Hally turns to bootlegging, and out-of-work Eddie Bartlett becomes a cab driver. Eddie builds a fleet of cabs through delivery of bootleg liquor and hires Lloyd as his lawyer. George becomes Eddie's partner and the rackets flourish until love and rivalry interfere.
Allen Colby, heir to a huge fortune, is presumed drowned after an ocean liner sinks off the coast of Honolulu. Mysteriously, Colby reappears at his mansion only to be murdered soon after. When his body is discovered during a seance, everyone in attendance becomes a suspect, and it's up to Chan to find the murderer before he or she strikes again.