Jonny knows better than anyone that life is full of cruel ironies. He's spent every day in a hospital hooked up to machines to keep his heart ticking. Then when a donor match is found for Jonny's heart, that turns out to be the cruellest irony of all. Because for Jonny's life to finally start, someone else's had to end. That someone turns out to be Neve's twin brother, Leo.

When Leo was alive, all Neve wanted was for him (and all his glorious, overshadowing perfection) to leave. Now that Leo's actually gone forever, Neve has no idea how to move forward. Then Jonny walks into her life looking for answers, her brother's heart beating in his chest, and everything starts to change.

Together, Neve and Jonny will have to face the future, no matter how frightening it is, while also learning to heal their hearts, no matter how much it hurts.