Theresa encounters an attractive stranger on the subway, who brings her to orgasm amidst the hustle and bustle of the morning rush hour. Although she believes she will never see this man again, she soon meets him once more. Theresa feels deeply drawn to his demanding eroticism and allows herself to be swept away into a secret world of dominance and submission. However, her best friend Marie becomes very worried when Theresa suddenly goes missing without a trace.