A sinister con man, Roat, and two ex-convictsare about to meet their match. They have traced the location of a mysterious doll, which they are much interested in, to the Greenwich Village apartment of Sam Hendrix and his blind wife, Susy.

Sam had apparently been persuaded by a strange woman to transport the doll across the Canadian border, not knowing that sewn inside were several grams of heroin. When the woman is murdered the situation becomes more urgent.

The con man and his ex-convicts, through a cleverly constructed deception, convince Susy that the police have implicated Sam in the woman's murder, and the doll, which she believes is the key to his innocence, is evidence. She refuses to reveal its location, and with the help of a young neighbor, figures out she is the victim of a bizarre charade.

But when Roat kills his associates Susy knows the only way to play fair is by her rules, so when darkness falls she turns off all the lights leaving both of them to maneuver in the dark.