Imposter: Book two of the Live Once Trilogy

Mira was supposed to die so that Socrates, a powerful First, could continue his immortality. But against all odds, she survived. More than that, she took Socrates's identity. Now, she must face the government, the rebels, and the young man she loves in the fight to forge a better future for her people. Will was supposed to save her, but he watched her die instead. He doesn't know Mira's alive, or that she carries the identity of Socrates, the man he's sworn to protect with his life. Too bad...