In 2003 Harris turned his attention to ancient Rome with his acclaimed "Pompeii." The novel is about a Roman aqueduct engineer, working near the city of Pompeii just before the eruption of Vesuvius in 79 AD. As the aqueducts begin to malfunction, he investigates and realises the volcano is shifting the ground and damaging the system and is near eruption. Meanwhile, he falls in love with the young daughter of a powerful local businessman who was illicitly dealing with his predecessor to divert municipal water for his own uses, and will do anything to keep that deal going.