The yacht of millionaire Hellmann explodes in the Mediterranean Sea, with him and 8 men crew on board. Insurance agent Lucas investigates at the Cote D'Azur, because there's the suspicion that it could have been suicide. He finds out that Hellmann's villa was monitored, the tapes also contain information about the explosion. He uses them for blackmail.
Maurice Ronet
Marthe Keller
Karin Dor
Raymond Pellegrin
André Falcon
Robert Dalban
Walter Kohut
Charlotte Kerr
Eva Pflug
Philippe Baronnet
Alf Marholm
Karl Walter Diess
Herbert Fleischmann
Friedrich Nowottny
Heinz Baumann
Günter Mack
Anton Diffring
Klaus Schwarzkopf
Johannes Mario Simmel
Christian Barbier