Florence. Summer, 1538.
A night patrol finds a rich merchant hanged and set ablaze in the city’s main piazza. More than mere murder, this killing is intended to put the fear of God into Florence. Forty years earlier on this date, puritanical monk Girolamo Savonarola was executed the same way in the same place. Does this new killing mean Savonarola’s vengeful spirit has risen again?
Or are his fanatical disciples plotting to revive the monk’s regime of holy terror? Cesare Aldo has his suspicions but is hunting thieves and fugitives in the Tuscan countryside, leaving Constable Carlo Strocchi to investigate the ritual killing. When another important merchant is slain even more publicly than the first, those rich enough to escape the summer heat are fleeing to their country estates. But the Tuscan hills can also be dangerous places.
Soon growing religious fervor combines with a scorching heatwave to drive the city ever closer to madness, while someone is stalking powerful men that forged lifelong alliances during the dark days of Savonarola and his brutal followers. Unless Aldo and Strocchi can work together to stop the killer, Florence could become a bonfire of the vanities once more . . .