- Author:
- Joseph Schull
- Adapted by:
- Cynthia Pughe
- Producer:
- Ayton Whitaker
- Ponter:
- Frank Tickle
- Capt John Mason:
- Norman Claridge
- Witihera, Edward Mason's chauffeur:
- John Cazabon
- Prudence Mason (as a child and woman):
- Marjorie Westbury
- Richard Mason, her brother:
- Christopher Langley
- Catherine Patemaude, their governess:
- Olive Gregg
- Edward Mason:
- Donald Bisset
- An old manservant:
- Tony Quinn
- Mr Ovrum, a detective:
- Edward Lexy
- Club Attendant:
- John Cazabon
- Phil,ip Graves (alias Porter):
- Bernard Braden
- Canadian Police - PC Weathers:
- Alan Keith
- Canadian Police - Inspector Manley:
- Stanley Maxted
- Mabel, a Post Office assistant:
- Mavis Villlera
- Mrs Jackson, Canadian housewife:
- Gwen Day Burrough
- Shop assistant:
- MacDonald Parke
