- Writer:
- Giles Cooper
- From the novel 'Tour de Force' by:
- Christianna Brand
- Production:
- Raymond Raikes
- The Storyteller:
- Gabriel Woolf
- Inspector Cockrill:
- Norman Wooland
- Fernando Gomez, a courier for Odyssey Tours:
- Howard Marion-Crawford
- Helen Rodd:
- Marjorie Mars
- Miss Trapp, who lives in Park Lane:
- Madeleine Christie
- Leo Rodd Helen's husband, a former concert pianist:
- Noel Johnson
- Mr. Cecil of Christophe et Cie Couturiers:
- Heron Carvic
- Louvaine Barker (Louli), a novelist:
- Denise Bryer
- A Juanese servant:
- Harold Young
- El Gerente, Chief of Police in the island of San Juan el Pirata:
- Philip Leaver
- A Juanese warder:
- Armand Guinle
- Lollita:
- Eva Huszar
