A husband-and-wife detective team look into the murder of one of her friends, whose father--a prominent scientist--has been kidnapped. They find themselves up against a sinister crime organization headed by a mysterious figure known only as "Z".
John Bentley
Paul Temple
Dinah Sheridan
Steve Temple
Jack Livesey
Sir Graham Forbes
Beatrice Varley
Mrs. Weston
Barbara Couper
Mrs. Morgan
Jenny Mathot
Jacqueline Giraud
Andrew Leigh
Professor Hardwick
Hugh Dempster
Oliver Ffollett
Dino Galvani
Van Draper
Ivan Samson
Major Murray
Bruce Seton
Bill Bryant
Leo de Pokorny
Dr. Steiner
Michael Brennan
Hammond
Joseph O'Conor
Inspector Crane
Shaym Bahadur
Rikki
Gerald Rex
Ernie
Ben Williams
Mr. Weston
Anne Hayes
Celia Hardwick
Peter Butterworth
Post Office Engineer
Hamilton Keene
An Interested Visitor
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