In Manhattan, the mute seamstress Thana is a timid woman who works in the fashion industry and spends most of her time at home. One night, she is raped in an alley while going home after dark, and before she arrives at her house, she is raped a second time by another criminal. This time, she reacts and kills the assaulter with a flatiron. The disturbed Thana then loses her sanity and uses the rapist s pistol to begin killing men on the streets of New York.