Young aristocrat Arnaud de Maule hires female private detective Claude Alphand to investigate a strange cult, the Church of the Final Revival, that tried to recruit his girlfriend Chloé, who then disappeared, and it now stalks him.
A young heiress leads a life of excess and wants to marry a man her rich father despises. When her father suspiciously dies, and someone tries to kill her, she surrounds herself with her cousins, friends and lovers, all possible suspects.
1905, the cinematograph has reached Southern Italy, and casts fear among the people to whom it seems a devilish trick. They call it "o 'imbroglie din t'o lenzuolo" - "The Trick in the Sheet", as white sheets were used for screening.