Cast
- Ralph Bellamy as Ellery Queen
- Margaret Lindsay as Nikki Porter
- Charley Grapewin as Police Inspector Richard Queen
- James Burke as Police Sgt. Velle
- Michael Whalen as Dr. James Rogers
- Marsha Hunt as Barbara Braun
- Fred Niblo as John Braun
- Charles Lane as Doc Prouty
- Ann Shoemaker as Lydia Braun
- Marion Martin as Cornelia
Crew
- Kurt Neumann · Director
- Frederic Dannay · Writer
- Manfred Lee · Writer
- Eric Taylor · Writer
- James S. Brown Jr. · Cinematographer
- Dwight Caldwell · Editor