Prisoners -- Assassin -- Deserter.

"In Pyrrhia, every dragon has a story ... Before the dragonets, beyond the war of the SandWing queens -- the dragons of Pyrrhia each have their own story to tell. Like Fierceteeth, stuck in a SandWing prison, obsessed and full of thwarted ambition. Deathbringer, at the very beginning of his journey, desperate to prove himself. And Six-Claws, a loyal SandWing who will soon find out that loyalty comes with a price. Fly further into the dangerous territories of Pyrrhia than ever before to learn the secrets behind Wings of fire."