Faced with a broken marriage, a woman decides to try to rekindle incestuous relationship with her younger sister, who is married to a wealthy older man.
Susan Strasberg
as Martha
Nathalie Delon
as Diana
Massimo Girotti
as Alex
Giancarlo Giannini
as Dario
Lars Bloch
as Martha's Lover
Franco Abbiana
as Party Guest
Gianni Pulone
as Party Guest
Attilio Dottesio
as Party Guest
Rossana Canghiari
as Train Passenger (uncredited)
Alfonso Giganti
as Diana's Driver (uncredited)
Filippo Perego
as Party Guest (uncredited)
