Vosper’s revenge: book three of the dragon stone

Series Bestsellers! Over 100,000 copies sold!  Vosper's Revenge is the final book in Kristian Alva's popular "Dragon Stones" trilogy. As the races of Durn stand on the brink of war, the power-hungry emperor plans his conquest of the entire continent. The dragon riders are fragmented. They have been scattered across the land; weakened by the discovery of a traitor in their own ranks. Are the riders strong enough to defeat Vosper before he destroys them all? Audience: Young Adult Fantasy