Smile Before Death (1972)

Teenaged Nancy Thompson arrives unexpectedly at her mothers county villa. She discovers that her mom has died a violent death.The police investigate and believe the she killed herself by cutting her throat with a piece of broken of glass.Nancy meets and becomes friends with Gina who was her mothers best friend and who has a special relationship with her stepfather.Soon the older man turns his roving eye toward this young beauty as suspicion about the suicide starts to come to light.