Heir to thorn and flame
(Book)

"Married to a ruthless prince... For years, Max had to serve and obey the vicious magical nobles. Now he is one of them. When the heir to the throne attacks him, Max accidentally responds with a lethal burst of magic. Max is certain he will be executed. But his power is too rare and precious for that... Instead, the king forces him to become the boy he killed, taking on the identity and duties of the heir. That includes an arranged marriage--to the dangerously attractive Prince Camron. Living a lie, Max knows he can trust no one. Not Camron. And definitely not Simion, a handsome, dragon-riding spy sent to test his loyalty. As a deadly struggle for power begins and desire sparks, Max must protect his secret and his heart at all costs."--Provided by publisher.