During a sweltering week in late August, as Rome's richest citizens relax in their villas around Pompeii and Herculaneum, there are ominous warnings that something is going wrong. Wells and springs are failing, a man has disappeared, and now the greatest aqueduct in the world - the mighty Aqua Augusta - has suddenly ceased to flow . . .

Through the eyes of four characters - a young engineer, an adolescent girl, a corrupt millionaire and an elderly scientist - Robert Harris brilliantly recreates a luxurious world on the brink of destruction.