"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 the 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...

Told in alternating perspectives, Todd replays the events that lead to his death in the local park, watching as detectives investigate his murder and talk to the students responsible for it, and meanwhile Georgia, who does not know Todd, cannot stop thinking about him.