Sydney Wells should have died. She was supposed to die. But after years of waiting, she has been given a new heart. Her only job is not to break it.

Still, she can’t help thinking about how her second chance means that someone else’s life was cut short. After some detective work, Sydney concludes that her donor was a girl called Mia who died tragically in a nearby town.

Desperate for closure, she attends her memorial service, where she meets Mia’s best friend Clayton: a boy who makes her new heart race...