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Following the hold-up of an armored truck, some stolen bank notes show up at the winter quarters of Barberini's Circus, and Scotland Yard's Inspector Elliott is sent to investigate. The murdered body of one of the robbers is found, and a short time later Gina, a circus starlet, also is slain. The chief suspects are: Gregor, the lion tamer, who wears a black mask to conceal his disfigured face; Carl, the ringmaster, who believes his father was killed by Gregor's twin brother; Mario, the knife thrower, who was insanely jealous of the dead Gina's suitors; Mr. Big, a dwarf who is blackmailing Gregor; Eddie, the bookkeeper, who never realized his ambition of becoming a circus performer; and Natasha, Gregor's niece, the daughter of the man Carl is seeking. Eventually it is established that Gregor found the missing robbery money and hid it in a suitcase. He tries to escape with his loot but is murdered by a masked figure. Furthermore, it is revealed that Gregor is actually Natasha's father and that Carl's father died accidentally from a fall. Although this aspect of the mystery is solved, Inspector Elliott adheres to his belief that Gregor was not responsible for the two murders. Acting on a hunch, he arranges for Eddie to be given a chance to assist Mario in his knife-throwing act. When Mario switches weapons and uses knives identical to the ones used in the murders, Eddie breaks down and admits that his envy of the performers led him to commit the murders.