Widower John Woolfolk (Mayo) is sailing his yacht along the Georgia coast with his friend Paul Halvard (Sterling) when they make anchor in an inlet to get fresh water. John discovers a dilapidated mansion where homicidal brute Iscah (Post) is holding southern beauty Millie (Vallie) and her grandfather (de Brulier) as virtual hostages and he tries to rescue them (with mixed success). Vidor shot on Florida locations.