The hourglass door has closed behind Dante, sending him back in time to hunt down Zo, Tony, and V. Abby knows that Dante, as a Master of Time, is the only one who can stop them from destroying time itself. She also knows that he will need her help. But almost immediately, things start to change, and Abby’s worst fears are realized when Zo begins targeting her past specifically. As Abby’s world fractures around her, she must face a terrible truth: either Dante didn’t make it through the door, or he is lost forever. So with Dante’s blueprints in hand, she begins construction on a new door, a new time machine that will either save Dante—or doom him. With each new change that ripples into her present, Abby s life continues to spiral out of control. Her relationships with Jason, Natalie, and even her family are threatened to the breaking point—and beyond. Zo’s power is greater than Abby ever imagined, but as she struggles to free Dante, she receives help from an unexpected—and unlikely—ally.