A Matter of Destiny by Meredith Hart

Rayne helped Doshir and his mother escape from Valgros and from the clutches of King Donovan’s wicked advisor. But she turned down Doshir’s offer to flee with them and stayed in Valgros, determined to discover how deep the deceptions run in her kingdom. It’s a dangerous game, especially once it becomes clear that Donovan’s advisor has plans of his own… for her.
Doshir escaped from Valgros with his life, his mother, and the dangerous knowledge that Rensivar the Wicked, the legendary enemy of the draconic kingdom of the Iron Mountains, is very much alive. Now he just needs to decide what to do with that knowledge. Will the Iron Mountains believe him if he tries to warn them? Or will Rensivar find him first?
Because Rensivar the Wicked’s deceptions run deep, and his bid for power includes deadly magic no living dragon has ever witnessed.