A speed-boat racer suffers amnesia after an boating accident and goes to his isolated villa to recuperate. His relationship with his wife is troubled, so he starts an affair (sort of) with the another woman, which results in one of the three of them being shot. But there are several more twists--and more murders--to come.
| Actor | Role |
|---|---|
 Philippe LeroyMarco Breda | Marco Breda |
 Elga AndersenMonica Breda | Monica Breda |
 Ivan RassimovBurt | Burt |
 Rosanna YanniTerry Povani | Terry Povani |
 Franco ResselTommy Brown | Tommy Brown |
 Rina FranchettiAnna - The Maid | Anna - The Maid |
 Julio PeñaInspector Baldini | Inspector Baldini |
 Franco FantasiaProfessor Mauri | Professor Mauri |
 Giorgio CerioniThe Chauffeur | The Chauffeur |
 Liana Del BalzoMrs. Foschi | Mrs. Foschi |
 Carla ManciniLawyer's Secretary | Lawyer's Secretary |
 Mario MoralesBreda's Gardener | Breda's Gardener |
 Franco BalducciSante Foschi | Sante Foschi |
 Ferdinando PoggiSantini | Santini |
 Franco MarlettaGas station attendant | Gas station attendant |
| MMario Della VignaNot listed | Not listed |
| VVincenzo BalestrieriSelf - World Champion of Off-Shore | Self - World Champion of Off-Shore |