Martin Lynch-Gibbon believes he can possess both a beautiful wife and a delightful lover. But when his wife, Antonia, suddenly leaves him for her psychoanalyst, Martin is plunged into an intensive emotional re-education. He attempts to behave beautifully and sensible. Then he meets a woman whose demonic splendour at first repels him and later arouses a consuming and monstrous passion. As his Medusa informs him, this is nothing to do with happiness.