EDITOR’S NOTE: The Trygon Factor was on the CBS Late Movie on January 23, 1973 and January 2, 1974.

Das Geheimnis der weißen Nonne (Mystery of the White Nun) is called The Trygon Factor over here in the U.S. and is based on the Edgar Wallace book Kate Plus Ten.

Inspector Cooper-Smith (Stewart Granger) is looking for whoever is stealing a variety of unconnected goods. That leads him to the country manor of a respectable English family, the Emberdays, and the mistress of the house, Livia (Cathleen Nesbitt). Could she — or Sister General (Brigitte Horney) and the nuns that live in her home — be behind the thefts to save what’s left of the family fortune? After all, one cop — Inspector Thompson (Allan Cuthbertson) — has already been murdered at Emberday Abbey. It might even be the Emberday children, Trudy (Susan Hampshire) or Luke (James Culliford).

The Trygon Factor finds itself more on the Eurospy side of the equation than the nascent giallo as the krimi cycle of films was beginning to slow down. Director Cyril Frankel also directed episodes of UFO, The Avengers and Return of the Saint and well as the Nigel Keale-written The Witches and the original School for Scoundrels. It was written by Derry Quinn (Young, Willing and Eager) and Stanley Munro.

This has a scene where one of the gang wears a yellow suit of armor and has a gigantic gatling gun that they use to burst through a bank wall, a scene only topped by Stewart Granger punching a nun right in the face.