Celia, housewife, mother and wonderful cook, is celebrating her fortieth birthday. In her smart London home, her major worries are private schooling and the misplaced zeal of Neighbourhood Watch vigilantes. But the house of cards collapses around her, as friends and a sister turn edgy and fickle, a long-time admirer turns into a crude jester, and Celia spies her husband embracing a ghastly woman in a 'Come Dancing' frock.