Every August, Florence shimmers in the summer heat. But this year the heatwave is fiercer than usual, and the city's inhabitants have fled to the cool of the hills and beaches of the surrounding countryside. But former policeman turned private detective Sandro Cellini will not be joining them, and nor will the manager of a branch of a small, failing provincial bank. Sandro has a case: a man who seems to have vanished into thin air leaving his pregnant wife behind him. But the bank manager lies amidst the shrubbery of a busy roundabout, his corpse bloating in the humid air. Meanwhile, bank-teller Roxana Delfino is both worried by her mother's state of mind - is her memory failing? Has she imagined an intruder onto their property? - and puzzled by the disappearance of one her regular clients.