Joanna has everything a woman could desire: as the young, beautiful wife of a wealthy financier, her days are her own to spend at leisure - but her nights are solitary. Her older husband sleeps alone, and Joanna increasingly seeks a sense of fulfilment, some traces of danger and excitement to satisfy her. Several chance encounters shock Joanna into action. She becomes inolved with the mysterious 'O', a woman whose clients and employees experiment with pleasure, pain and 'issues of control'. Joanna's experiences with 'O' are excting, but also dangerous. Identities are revealed, alliances shifted and plots undertaken. Joanna begins to gather secrets and to lay the foundation of her terrible revenge.