Cara has spent her life on the streets, relying on her wits - and a mysterious voice that seemed to live inside her head - for survival. She's amazed when she learns that the voice actually belongs to a dragon - her dragon - and she's invited to join a hidden society for other young dragonseers. But Cara isn't used to having friends, and so when she and her dragon Silverthief uncover a dangerous secret, they must decide who they can trust - and their lives will depend on it.