Cast
- 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
Crew
- Ralph Staub · Director
- Frederic Dannay · Writer
- Manfred Lee · Writer
- John Francis Larkin · Writer
- Rex Taylor · Writer
- Jack A. Marta · Cinematographer
- Grace Goddard · Editor
- Murray Seldeen · Editor