Who is the mysterious stranger Cecilia met on the street? Why is he suspicious of everyone? She is happily married, has a lovely child and a good job: yet she decides to join him and to become his lover, sharing his destiny right up to its tragic conclusion.
| Actor | Role |
|---|---|
 Clio GoldsmithCecilia | Cecilia |
 Vittorio MezzogiornoVittorio | Vittorio |
 Alida ValliBettina | Bettina |
 Yves BeneytonGiovanni | Giovanni |
 Francesca RinaldiViola | Viola |
| VVittorio MarchettiPadre di Cecilia | Padre di Cecilia |
 Francesca ArchibugiNot listed | Not listed |
 Federico PacificiNot listed | Not listed |
| PPasquale ZitoNot listed | Not listed |