Isabelle (Marisa Mell) runs a nursing home for wealthy women who are trying to detox from their various obsessions. Her lover, Serge Belaiev (Robert Hossein), a petty gangster, has pulled off a big hit but his partners have denounced him to the police in order to appropriate his share of the loot. Isabelle takes him in and hides him in an attic of this strange house. In love with Isabelle, Philippe Lansac (Alberto Dalbes), the owner of the place, decides to close the castle...