Herbert J. Biberman Director Edward Arnold Nero Wolfe Actor Lionel Stander Archie Goodwin Actor Dennie Moore Mazie Gray Actor Victor Jory Claude Roberts Actor Nana Bryant Sarah Barstow Actor Joan Perry Ellen Barstow Actor Russell Hardie Manuel Kimball Actor Walter Kingsford Emanuel Jeremiah Actor Boyd Irwin Prof. Edgar Barstow Actor John Qualen Olaf Actor Gene Morgan Det. Lt. O'Grady Actor Rita Hayworth Maria Maringola Actor Frank Conroy Dr. Nathaniel Bradford Actor Juan Torena Carlo Maringola Actor Joseph Anthony Screenwriter Howard J. Green Screenwriter Bruce Manning Screenwriter B.P. Schulberg Producer Howard Jackson Original Music Henry Freulich Cinematographer Otto Meyer Film Editing Stephen Goosson Art Director Lon Anthony Costume Design