Knife of Ice
A famous singer, Jenny Ascot (Evelyn Stewart), visits her cousin Martha Caldwell (Carroll Baker) at her home in the Pyrenees. Caldwell has long been rendered mute after witnessing both her parents being killed in a train crash. While Ascot and Caldwell are travelling to Caldwell's home, they notice a strange man who seems to be following them. That night, at Caldwell's villa, Ascot hears noises coming from the garage, and when she investigates, is killed by an unseen figure. The police believe the killing is connected to the murder of a teenage girl hours before, and their prime suspect is a local hippy they are convinced is a drug-addicted Satanist. However, two more murders occur while this suspect is in custody. Several other locals are placed under suspicion, including a doctor (Franco Fantasia), a chauffeur (Eduardo Fajardo) and an occultist (George Rigaud). Eventually the man who Caldwell and Ascot saw following them is arrested, and the police discover that his girlfriend had been found murdered several days earlier. However, after this man is taken into custody, Caldwell's friend Christina is also murdered, prompting police to reopen the investigation. After they find that their suspect's girlfriend had died of a drug overdose, rather than being murdered, it eventually comes to light that the killer is Caldwell herself. She had killed Ascot out of jealousy of her singing voice, which piqued her interest in murder, and resurfaced to kill Christina when the girl had discovered evidence linking Caldwell to the crimes.
