Stella Day will one day be the Protector of Earth, but right now she's focused on other things. Surviving high school, having a winning soccer season and balancing the two guys in her life fighting for her attention. She isn't ready for her future or the massive destiny waiting for her. Unfortunately for Stella, destiny isn't patient. Stella's life becomes complicated when the Darkness won't leave her alone. In a risky effort to save her life, Seth makes a deal with the devil that changes everything. Suddenly, it's no longer her own life that Stella is desperate to save. She must find a way to protect her Counterpart before he becomes the worst threat of all. As Stella grapples with the intensity of her feelings for both Tristan and Seth, her choice might just be made for her. While the Darkness demands her attention, humanity and the high school life she loves will fade into the background as she embraces the purpose she was given and the most complicated battle yet. This time it's not just her life on the line, but her heart as well.