THE TRYGON FACTOR - Stewart Granger, Susan Hampshire (1966)

HELL IS EMPTY:

A tension filled crime drama set in Prague in which Major Morton leads a daring robbery, on the run the gang hide out in an isolated Island mansion, holding it's five, very different inhabitants at gunpoint.

CAST:  Martine Carol, Anthony Steel, Jess Conrad, Shirley Anne Field, James Robertson Justice, Catherine Schell.  DIR: John Ainsworth (1967)
 

THE TRYGON FACTOR:

Scotland Yard Detective Cooper-Smith is investigating a string of robberies and a murder, leading him to the estate of a wealthy but strange family, who share their mansion with an order of nuns.
He soon begins to suspect that neither the family nor the nuns are quite what they appear to be.                  

CAST:  Stewart Granger, Colin Gordon, Susan Hampshire, Robert Morley.  DIR: Cyril Frankel (1966)