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.
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