Attention: Wikipedia contains spoilers
Eva, an upper class housewife, becomes frustrated and leaves her arrogant husband. She is drawn to the idea of becoming a call girl. With the aid of a prostitute named Yvonne, Eva learns the basics and then they both set out looking for prey together. Consequently, they move into his penthouse, large enough for both of them to offer their services separately.
Then slowly Eva is drawn to the dark side of her profession as she enters the world of sado-masochism. She finds being a dominatrix extremely satisfying, and begins to take pleasure in causing others intense pain. She discovers this in a scene in which a man is hiding under a table. Eva can see that his hands are sticking out from under the table and are clearly visible. Coldly, and with intense inner satisfaction, Eva proceeds to crush the man's hands by slowly walking over them with her stiletto-heeled boots.