Callie lost her parents when the Spore Wars wiped out everyone between the ages of twenty and sixty. She and her little brother, Tyler, go on the run, living as squatters with their friend Michael and fighting off renegades who would kill them for a cookie.

Callies only hope is Prime Destinations, a disturbing place in Beverly Hills run by a mysterious figure known as the Old Man. He hires teens to rent their bodies to Endersseniors who want to be young again. Callie, desperate for the money that will keep her, Tyler, and Michael alive, agrees to be a donor. But the neurochip they place in Callies head malfunctions and she wakes up in the life of her renter.Callie soon discovers that her renter intends to do more than partyand that Prime Destinations plans are more evil than she could ever have imagined.