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 is: there’s an app for that. It’s called the Last Friend, and through it, Rufus and Mateo are about to meet up for one last great adventure—an unforgettable day that will change both their lives forever.