What if you could fix the worst day of your life? Eight months after magic was revealed to the world, teenage sorcerer Perry Spring has discovered time travel. But when she and her friends accidentally alter the past, they must journey to parallel timelines, the Ice Age, and a distant future to make things right. Along the way, they’ll contend with pocket universes, evil Euclideans, dark doppelgangers, and plenty of head-cracking conundrums. And this time, not all of them will survive.