Florence, summer 1963. Inspector Bordelli is one of the few policemen left in the deserted city. He spends his days on routine work and his nights tormented by the heat and mosquitoes. Suddenly one night, a telephone call gives him a new sense of purpose: the suspected death of a wealthy signora. Bordelli rushes to her hilltop villa and picks the locks.

Florence, October 1966. The rain is never-ending. When a young boy vanishes on his way home from school the police fear the worst, and Inspector Bordelli begins an increasingly desperate investigation. Then the flood hits. During the night of 4th November the swollen River Arno, already lapping the arches of the Ponte Vecchio, breaks its banks and overwhelms the city. Streets become rushing torrents, the force of the water sweeping away cars and trees,...