Ellery Queen solves a mystery involving a valuable stamp.
Eddie Quillan
as Ellery Queen
Charlotte Henry
as Josephine Temple
Rita La Roy
as Martha Kirk
Wade Boteler
as Inspector Queen
Franklin Pangborn
as Mellish
George Irving
as Dr. Alexander Kirk
Kay Hughes
as Irene Kirk
William Newell
as Detective Guffy
George Walcott
as Donald Trent
Edwin Stanley
as Howard Bronson
Edgar Allen
as Detective
Richard Beach
as Reporter