Easter, 1872. Fires burn in St Petersburg, a prelude to the revolutionary turmoil that will shake Russia a generation later. As the springtime thaw begins, a body rises to the surface of the Winter Canal. Following an anonymous tip-off, magistrate Porfiry Petrovich is drawn into an investigation of the radical intellectuals who seek to fan the flames of revolution. In the meantime, junior magistrate Pavel Pavlovich Virginsky plays a dangerous game of his own. Following a chance meeting with a man he suspects of being an arsonist, he volunteers to infiltrate a terrorist cell. But the young man’s loyalties appear divided, his motives conflicted. Will he track down the killers, or to use his position as a magistrate to further a cause with which he sympathises? The issue comes to a head in a shocking and violent confrontation between two generations. The Cleansing Flames is the fourth book in R. N. Morris’s acclaimed series featuring the investigator from Crime and Punishment. Nominated for the 2011 CWA Ellis Peters Award for best historical crime novel.