Don't miss, at the seventy third minute, the short appearance of three seconds of Alain Delon as a cameo. He rings at the apartment door where Mireille Darc and her co star Constantin live. His name is not in the credits lines.
Original literary source : "TTX-75 en famille", spy novel by Richard Caron, published by Editions Fleuve Noir (collection Espionnage N° 705), Paris, 1968, 250 pages.