The Marshall Family (1970)

The night before Candice Marshall's birthday, her husband, Rick, and daughter, Amy, are planning a surprise party. In true party fashion, an unexpected guest has arrived with plans for a different kind of celebration. The family is stalked and terrorized by a deeply disturbed man hell-bent on exposing the family's dark twisted secrets and lies. He slowly exposes the inner working of the Marshall household with his knowledge through intimidation and torment.