A young idealistic doctor works at his father's clinic in a small and seedy district. During the war, he contracts syphilis from the blood of a patient when he cuts himself during an operation. Treating himself in secret and tormented by his conscience, he rejects his heartbroken fiancée without explanation.
When a young woman is named as the prime suspect in a murder, her girlfriend and her girlfriend's boyfriend set out to prove her innocence. Their investigation leads them to an isolated, creepy house in the middle of nowhere, where sinister goings-on abound.
