Charlie and Parker are twins-- but they're polar opposites. He's fearless, outgoing; she's careful, reserved. And Charlie is officially in remission from cancer. Parker lands a prestigious summer internship at the hospital and is headed to Harvard in the fall to study pediatric oncology-- and her relationship with Charlie has been on the rocks since his diagnosis. Parker meets Finn, who's been leaving strange graffiti messages all over town. Those messages-- and Finn-- make Parker feel free to doubt, free to make mistakes, and free to confront the truth that she has been hiding from for a long time. -- Adapted from jacket.