for as long as anna can remember, every song she has listened to has been overlaid with the voice of boy next door, tobias. in the car, if katy perry was singing firework, toby was too. if the fray was blasting from anna's headphones, she could see toby mouthing the words. but when toby disappears one day without a trace, anna is left with a box of tapes and an empty passenger side. at first, anna is hesitant to listen to the tapes, worried that what they contain would shatter everything she knew. but, at the same time, she misses his voice. she just wishes that she could hear it in person.

Charlie is in serious hot water. After a naked girl falls from the sky, lands on his lawn, and claims to be from heaven, his entire summer is flipped upside-down. This girl can talk to animals, fight like a ninja, and hear people's thoughts. Plus, it doesn't hurt that she's got the most gorgeous blue eyes this side of the equator and skin as soft as goose down. But she is on earth for one reason and one reason only: to save a lost soul left behind on the wrong plane. Charlie agrees to help her, but when her jealous partner shows up to speed up the process, things get tense for all of them. Can Charlie let go of the one thing that has ever made him feel worthwhile? And more importantly, does she feel the same?

Bree and Eve share one body, but they are two girls as different as day and night. Eve is secretive and unpredictable. Bree withholds nothing from her other half. Eve prefers to create resolution through violence. Bree can barely stand the sight of blood. But one goal unites them: desire to be safe from the Trackers who hunt their kind. And for years they wander from city to city, in search of freedom and the little brother Bree believes is still alive. When Bree meets Daniel, a young man with dangerous connections and a penchant for taking in strays, including her, she finds it hard to move on. But the secret she hides risks doing more than driving them apart. It might just turn them into enemies. There's also Tristan, a boy with secrets of his own-secrets that help Eve. As her strength grows and Bree struggles to keep up, the two girls are pitted against each other in a battle over the body they share. And with the Trackers closer than ever to finding them, there's a chance neither of them will make it out alive.