Skylar never imagined that she'd end up helping a boy from another planet search through Earth's history for a way to end his people's secret control over her world. But now that she's been drawn into Win's group of rebels, she can't walk away until their mission is completed and her Earth is free. Whisked to the immense space station that Win and the rest of the Kemyates call home, Skylar escapes suspicion by passing as an Earthing "pet" of Win's rival, a brash and cocky boy named Jule. The other rebels don't quite treat her as an equal, but Skylar copes with her homesickness in this alien environment by throwing herself into work on the weapon they must finish assembling to save Earth. Her keen attention to detail and skill with numbers start to earn the Kemyates' respect. Unfortunately, that doesn't make her position any less precarious. The Enforcers are still intent on tracking down the rebels, and it becomes clear that someone within the resistance is leaking information to the enemy. With Win and Jule squabbling over her affections, and the entire rebel group growing increasingly suspicious of each other, Skylar feels her chances of saving Earth slipping away. It doesn't help that she's falling for Jule despite herself. Determined to see her mission through, she finds herself more and more wrapped up in the lives around her and discovers the truth is far more complicated than she could have expected. Setting Earth free may require her to betray both her heart and the family and friends she left behind.