Seventeen-year-old Parker Everett expects to receive letters from college admission offices, not from his dead ex-girlfriend. When Parker learns of Hadley's accidental death, his plans of attending college, playing lacrosse, and gliding through the rest of senior year, are frustrated by the grief and confusion he feels. And when Hadley's parents find a box of letters she'd written to him while she was still alive, Parker is terrified to read them, knowing the way he ended things with her. Shoved forward by the mantra that Hadley's story deserves to be read, Parker delves into the letters. When he lets Hadley's best friend, Kenzie, see them, things get even more complicated, threatening his relationship with his current girlfriend and the life he thought he wanted to live. As he starts to see things from Hadley's point of view, he becomes increasingly unsure of whether the letters will be the remedy he needs or lead to his ultimate undoing.