The Trygon Factor

The Trygon Factor
Directed by	Cyril Frankel
Produced by	Ian Warren Horst Wendlandt
Written by	Derry Quinn Stanley Munro based on a novel by Edgar Wallace
Starring	Stewart Granger Susan Hampshire Robert Morley
Music by	Peter Thomas
Cinematography	Harry Waxman
Edited by	Oswald Hafenrichter
Production company	Rialto Film
Distributed by	J. Arthur Rank Film Distributors (UK) Warner Bros.-Seven Arts (US)
Release date	December 1966 (West Germany) May 1967 (UK)
Running time	88 min.
Country	United Kingdom, West Germany
Language	English, German
Box office	73,066 admissions (France) 605,412 admissions (Spain) 1.6 million (West Germany)

The Trygon Factor is a 1966 British-West German crime film directed by Cyril Frankel and starring Stewart Granger, Susan Hampshire and Robert Morley. It is one of the films based on works by Edgar Wallace of the 1960s and its German title is Das Geheimnis der weißen Nonne. The film is based on the Edgar Wallace novel Kate Plus Ten.

A Scotland Yard inspector is called to investigate a series of unsolved robberies. Inspector Cooper-Smith (Stewart Granger) arrives at the country manor of a respectable English family. He discovers Livia Emberday (Cathleen Nesbitt), the mistress of the house, has turned to crime in order to bolster the family's flagging fortunes. With assistance from an order of bogus nuns, stolen goods end up in the warehouse of Hamlyn (Robert Morley), purportedly a respectable businessman.

The film premiered in West Germany on 16 December 1966.

The Radio Times called it a "farcical British crime drama";Variety noted, "a complicated Scotland Yard whodunit which the spectator will find taxing to follow...Script is pocketed with story loopholes and attempts to confuse, plus certain motivations and bits of business impossible to fathom. Granger still makes a good impression"; while Allmovie wrote, "there are plenty of twists in the storyline of this often complex mystery feature."

Cast member Susan Hampshire called the film "another B picture. Very often I did films because of tax demands" and said Stewart Granger had a big ego, but felt "we had a very interesting director in that film, Cyril Frankley, and I think it was one of the best acting performances I've ever given."