Unforgivable takes off where Invincible left us with Evie drowning in San Francisco Bay. Marcus finds her just in time, but her survival is not the happy ending he was hoping for. Forbidden from seeing Evie by her parents and unable to reach her, Marcus learns of a pain that might break him completely. Marcus spirals into an even deeper darkness and is forced by new events to face the demons of his past. The pain of losing Evie becomes tangled with the loss of his mother and brother, and he must finally face the ghosts he has been trying so desperately to outrun or risk losing Evie forever.