In this disturbing family drama, a prosperous middle-aged farmer takes up gambling and whoring at the expense of his devoted second wife. Meanwhile, his son the pervert becomes fascinated with the family's maid, a deaf-mute. The son's stepsister returns from college in hopes that she can marry the young engineer she fancies. Unfortunately her father hates the boy. Real trouble ensues when the perverted son sees his stepsister and the engineer make love. This inflames the twisted lad who then assaults and accidentally kills the maid. He attempts to hide the corpse in a hayloft, but the family finds it. The father then decides that it is better to sink it into the lake and tell the cops that the maid mysteriously disappeared. The sister does not know about the maid, but she does have her suspicions. She confronts her stepdad and then blackmails him into allowing her to marry. The family celebrates the union. As they party, a fisherman discovers the maid's corpse.