Keep My Grave Open (1976)

aka: The House Where Hell Froze Over

Lesley (Camilla Carr), a troubled single woman in her thirties, lives in an isolated farm estate miles from the nearest town. Someone is committing murders in the vicinity, and the only suspects are Lesley or her brother Kevin (Chelsea Ross). Among the victims are a hitchhiker (Bill Thurman) looking for food, local girl Susie (Ann Stafford), young farmhand Bobby (Stephen Tobolowsky) and “Twinkle” (Sharon Bunn), a middle-aged prostitute. Despite the attentions of compassionate Doctor Emerson (Gene Ross), Leslie sinks further into depression and sexual frustration; her only source of happiness is her own brother, to whom she is attracted. But is Kevin real, or a figment of Lesley’s imagination?