Troubled rich girl Carol Hammond (Florinda Bolkan) is suffering from a series of bizarre sexual fever dreams where she indulges in sapphic delights with her wild hippie next-door-neighbor Julia Durer (Anita Strindberg). However, one morning after another perverse sex dream culminating in a gory knifing of Julia, Carol awakens to find that Julia was murdered in her apartment the stormy night before. When all evidence points to Carol being the culprit, she must not only investigate the crime but determine what is dream and what is reality.