Carol Hammond (Florinda Bolkan) is the daughter of a wealthy lawyer and politician named Edmund Brighton (Leo Genn). Her husband Frank (Jean Sorel) is a lawyer working for Brighton's practice. They all live together in a large apartment with Joan (Ely Galleani), Frank's teenage daughter from a previous marriage. Carol has been visiting a psychoanalyst because of a string of disturbing dreams she's been having featuring her decadent neighbor, Julia Durer (Anita Strindberg). Julia's frequent, late-night parties infuriate and yet excite Carol, evoking images of wild sex-and-drug orgies.