The Trygon Factor

A Scotland Yard detective is investigating a string of robberies and a murder, and the information he uncovers leads him to the estate of a wealthy but strange English family, who share their mansion with a group of nuns. The detective comes to suspect that neither the family nor the nuns is quite what they seem to be.

• 
  Cyril Frankel

• 
  Stewart Granger
  Superintendent Cooper Smith
• 
  Susan Hampshire
  Trudy Emberday
• 
  Cathleen Nesbitt
  Livia Emberday
• 
  James Culliford
  Luke Emberday
• 
  Brigitte Horney
  Oberin
• 
  Robert Morley
  Hubert Hamlyn
• 
  Sophie Hardy
  Sophie
• 
  Colin Gordon
  Dice
• 
  Eddi Arent
  Clossen
• 
  Diane Clare
  Clare
• 
  Allan Cuthbertson
  Det. Thompson
• 
  Caroline Blakiston
  Nun
• 
  Richardina Jackson
  Nun
• 
  Yuri Borienko
  Nailer
• 
  Conrad Monk
  Pasco
• 
  John Barrett
  Guide
• 
  Jeremy Hawk
  Bank Manager
• 
  James Robertson Justice
  Sir John (voice)
• 
  Monika Dietrich
  Photographic Model
• 
  Joseph Cuby