Having casually overheard a confusing phone conversation between two women, Alberto manages to get in touch with one of the callers, Claudia, a painter. The two become lovers and things are spiced up by Claudia's ambiguous sexual nature and by the presence of her former lover, Pietro. Alberto discovers a pistol in Claudia's handbag and this leads to a further revelation: she's dominated by her stepmother Greta, who forced her into a clandestine lesbian relationship; of which Claudia is ashamed and wants to end - at all costs. Alberto, now a slave to love, runs Greta over. But Claudia denies urging him to murder...
| Actor | Role |
|---|---|
 Catherine SpaakClaudia | Claudia |
 Jean SorelAlberto | Alberto |
 Florinda BolkanGreta | Greta |
 Gabriella BoccardoViola | Viola |
 Gigi ProiettiPietro | Pietro |
 Luigi CasellatoAlberto's friend | Alberto's friend |
| GGino LavagettoPriest | Priest |
 Sergio GrazianiGreta's boyfriend | Greta's boyfriend |
| MMaria Luisa BavastroFausta | Fausta |
 Franco LeoViola's friend | Viola's friend |
| GGaetano ImbróViola's boyfriend | Viola's boyfriend |
| GGuglielmo BoglianiNot listed | Not listed |
 Luciano CatenacciNot listed | Not listed |
 Franco GiornelliAlberto's brother | Alberto's brother |
 Nello RivièNot listed | Not listed |
| RRoberto RigamontiNot listed | Not listed |
| MMargherita SimoniniNot listed | Not listed |
 María CuadraMarina | Marina |
 Malisa LongoGirl in Blue Bikini (uncredited) | Girl in Blue Bikini (uncredited) |
| AAnna Maria PeregoAlberto's mother (uncredited) | Alberto's mother (uncredited) |