A terrifying enemy is spreading a plague across the land, a sickness that kills or transforms everything it touches. Unable to contain the outbreaks, the King of Lankara begs the aid of the disgraced former Duke of Agrathon, Alyas-Raine Sera, a man who has spent years fighting syndicate expansion and whose resentment over his exile makes him an unpredictable, dangerous ally in the power struggle between the rulers of Ellasia and the mining companies.
Attached to the envoy to recall the duke, the apprentice surgeon Brivar finds his skills and loyalty tested as his service to his new patron uncovers secrets about Isyr and the plague that link it to the mining of Isyrium – and threaten the life of the man it is his duty to safeguard.
In their own separate ways, Alyas and Brivar must take on the might of the syndicates and confront the greed, murder, betrayal and impossible choices of a crisis that has been decades in the making – and the price of their failure could be everyone and everything.