Ugo (Ugo Tognazzi) is comfortably married to Lisa (Monica Vitti), he nonetheless takes up with pretty (and fetchingly underdressed) American Patty (Barbara Bouchet). In retalitaiton, Lisa begins an affair with French count Jean Claude (John Richardson), arousing Ugo’s jealousy. At his request, the four members of this romantic quadrangle repair to a summer house to come to a “civilized understanding”–which erupts into something out of the Keystone Kops.