Starters — Lissa Price

In the future, teens rent their bodies to seniors who want to be young again. One girl discovers her renter plans to do more than party--her body will commit murder, if her mind can't stop it. Sixteen-year-old Callie lost her parents when the genocide spore wiped out everyone except those who were vaccinated first--the very young and very old. With no grandparents to claim Callie and her little brother, they go on the run, living as squatters, and fighting off unclaimed renegades who would kill for a cookie. Hope comes via Prime Destinations, run by a mysterious figure known only as The Old Man. He hires teens to rent their bodies to seniors, known as enders, who get to be young again. Callie's neurochip malfunctions and she wakes up in the life of her rich renter, living in her mansion, driving her cars, even dating Blake, the grandson of a senator. It's a fairy-tale new life . . . until she uncovers the Body Bank's horrible plan. . . .