A beautiful young woman marries a blind old man for his money. She carries on an affair with her husband's valet, but soon finds herself in the middle of a murder-for-money plot involving the household servants.
A young American tourist (Sue Lyon) thinks she's hit the jackpot when a handsome Spaniard offers her money for sex. It turns out though he's procuring her for his blind, elderly employer (Fernando Rey). Embarrassed, she has sex with the old man anyway. He falls for her, and she in turn falls for the young servant. She and the servant agree that she should marry the blind old man, and then they can have access to his money while carrying on whenever he is out of earshot. Complicating matters, however, the servant himself is also sexually involved with the older head housekeeper (Gloria Grahame), who is suspicious (and jealous) of the new young lady of the house. Not surprisingly this all leads to murder.