Sydney Wells should have died. She was supposed to die.

She never expected, after years of waiting, to receive a heart transplant. Now, seventeen-year-old Sydney doesn't know what to do with her life. Her daily routine consisted of staying indoors, eating heart-healthy foods, and posting about her transplant list experiences on TheWaitingList with her long-distance BFF (and heart failure buddy) Chloe.

Now, Sydney latches onto the one thing that gives her meaning: learning as much as she can about the person whose heart she inherited. After finding the family of her likely-donor, Mia, Sydney falls deep into her world-and may also be falling for Mia's best friend, Clayton.