Hailey Banks has gotten used to taking risks, ever since she learned that her to-do list is the only thing able to save the world from a future disaster. But she never expected one item on her list to take her to another world in another dimension with Craig Williams, a kid who she has never met. Now, her bravery and intuition are exactly what Kara (the 13th Gladiator) and Mireya (the Seventh Tinkerer) need to overcome quite a conundrum on Pandora, when an enemy from Kara's personal future takes vengeance on her for an act committed in Pandora's past.