Detective Ellery Queen aids Free Dutch agents battle Nazi spies over a prize of industrial diamonds.

Famed detective and crime novelist Ellery Queen solves a case involving the suspicious death of a rich man whose inheritors fight over his estate.

Ellery Queen solves a mystery involving a valuable stamp.

Several days after one of his company's dams burst, ruining the life savings of several investors, a shady power company president is found stabbed to death. Ellery Queen gets to the bottom of the mystery.

Amateur sleuth Ellery Queen learns the truth about a businessman's two long-lost daughters.

Ellery Queen's vacation is interrupted when murder strikes next door to his oceanside cabin.

A man is framed for embezzlement and runs off to San Francisco. His wife hires Ellery Queen to try and track him down before the police get to him.

The benefactor of the Stack Memorial Hospital dies after an operation. Ellery Queen investigates when it is revealed the cause of death was murder by strangulation.

Chinese ventriloquist Gordon Cobb is murdered by a gang of jewel thieves. Baffled by the contradictory clues, Inspector Queen asks his son Ellery to help out.