After keeping their mentally disturbed younger brother locked away in the cellar for more than 30 years, two sisters (Beryl Reid and Flora Robson) are stunned to learn that he's broken free and set off on a murderous rampage. But as the bodies pile up, they begin noticing a pattern: All the victims are men on whom the sisters have had serious crushes. Can their brother's rage be squelched before there's no one left to love?