Catherine that he and Eva are not blood-related, and are in fact only stepsiblings. Eva confesses that she is sexually attracted to Catherine, and the three soon engage in a series of nightly debaucherous threesomes fueled by Peter and Eva's indulging of Catherine in liquor and stimulant drugs. One night, Catherine, disgusted with herself and in a drunken rage, orders Peter and Eva to leave the villa. They oblige, but soon return, and begin physically abusing Catherine and taking control of the house, subduing Catherine by forcing her to drink. Finding herself held hostage by the siblings, Catherine becomes increasingly desperate to escape Peter and Eva. She manages to produce a gun, with which she shoots Peter. Catherine loses consciousness due to a sedative fed to her by Eva, and awakens to find that the gun was loaded with blanks by the siblings, and that Peter was unharmed. The two bind and gag Catherine, tying her to a bed. When Brian visits the villa, Peter tells him that Catherine has descended into a depression, and has threatened to commit suicide. Locked in her upstairs bedroom, Catherine is further tormented by the siblings, who on one occasion serve her a live toad for dinner. The two later bring her whiskey and a large number of barbiturates, along with a falsified letter stating Brian has died in a plane crash, with the hope that Catherine will voluntarily kill herself by overdosing. Catherine manages to escape her bedroom and flees to the attic, accessing the roof of the villa. Brian arrives, and witnesses Catherine collapse over the edge of the roof, falling to the veranda below and fracturing her skull. Brian picks the injured Catherine up in his arms. The two briefly make eye contact before he ruthlessly throws her over the veranda onto the driveway below, killing her. Brian, who has conspired with the siblings to steal Catherine's fortune, produces two forged suicide notes, and orders Peter to alert authorities to Catherine's staged suicide. It is revealed that Brian is in fact Peter and Eva's uncle, and had Catherine unknowingly sign documents that bequeathed her estate to the trio. After the reading of Catherine's last will and testament, Brian is met by a detective who notifies him that New York police discovered that the brakes in Robert's car were tampered with, causing his fatal road accident. Brian momentarily fears their plot has