By early 1349, the Black Death cripples London and most of southern England. Fear and panic dominate the sad lives of the people. Wales remains free of infection, but for how long? Taking advantage of a perceived opportunity, 17-year-old Thomas de Parr takes up the banner of his ancestors. He seeks to right the wrongs inflicted on the Welsh by tyrannical English kings and ruthless Marcher lords. But first, he must establish a defensible position while he convinces the Welsh to join him in claiming his inheritance. Victory is uncertain, and the plague is an ever-present threat. To what lengths will Thomas go in order to succeed?

In this final installment of the Plagues and Princes trilogy, Thomas faces the ultimate challenge of both seen and unseen enemies. There is no turning back, and hiding is not an option. Death is the reward for failure. Will Thomas survive and establish his right to rule Wales free of English tyranny?