Emily Harper, the daughter of a gamekeeper and Drake's childhood friend, refuses to believe he's turned traitor. Determined to save him, she embarks on a perilous journey across Europe to find him. Their reunion in the enemy's stronghold reignites long-suppressed feelings, but Drake's internal battle between duty and desire threatens to consume them both. As the Order's war against the Prometheans reaches its climax, Emily's unwavering love may be the key to redeeming Drake's soul or it might not be enough to pull him back from the brink.