Here’s what Sam knows: There was a party. There was a fight. The next morning, Sam’s best friend, Hayden, was dead. All he left Sam was a playlist of songs—and a note, saying that he took his own life. But what Sam doesn’t know is: Why? To figure out what happened, Sam has to rely on the playlist and his own memory. But the more he listens, the more he realizes that his memory isn’t as reliable as he thought. Especially when someone claiming to be Hayden starts sending him cryptic messages, and a series of violent attacks begins on the bullies who made Hayden’s life hell. Sam knows he has to face up to what happened the night. But it’s only by taking out his earbuds and opening his eyes to the people around him—including an eccentric, unpredictable girl who’s got secrets, too—that Sam will finally be able to piece together his best friend’s story. And maybe have a chance to change his own.