The marketing executive for Quick Silver Tobacco Company is mysteriously murdered while alone in his office.
Ellery Queen probes the murder of a retired detective who was killed while investigating an unsolved homicide case.
Inspector Queen is in charge of protecting a mob witness, who gets murdered before he can testify, and all evidence points to Sgt. Velie.
Tunesmith Alvin Winer is murdered during the musical interlude on a radio show, and Ellery Queen tries to clear a friend's name in the case.
While visiting Simon Brimmer's radio studios, Ellery Queen learns that a socialite Lillian McGraw has been stabbed.
The Queens travel to Hollywood to watch the filming of one of Ellery's novels, only to get caught up in the murder case of the starring actor.