On September 5, a little after midnight, Death-Cast calls Mateo Torrez and Rufus Emeterio to give them some bad news: They’re going to die today. Mateo and Rufus are total strangers, but, for different reasons, they’re both looking to make a new friend on their End Day. The good news: There’s an app for that. It’s called Last Friend, and through it, Rufus and Mateo are about to meet up for one last great adventure—to live a lifetime in a single day.

Uplifting and devastating, charming and haunting, They Both Die at the End is a tour de force from acclaimed author Adam Silvera, whose debut novel the New York Times called “profound.” It’s a story that reminds us there’s no life without death, no love without loss—and that it’s possible to change your whole world in a day.