Il coltello di ghiaccio

Il coltello di ghiaccio is a 1972 giallo film directed by Umberto Lenzi. The film stars Carroll Baker, Evelyn Stewart and George Rigaud. Both Baker and Stewart featured in several other films helmed by Lenzi.

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 Caldwells home, they notice a strange man who seems to be following them. That night, at Caldwells 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 drugaddicted 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. ........

Source: Wikipedia