How would you spend your birthday if you knew it would be your last?

Eighteen-year-old Leonard Peacock knows exactly what he'll do. He'll say goodbye.

Not to his mum — who he calls Linda because it annoys her — who's moved out and left him to fend for himself. Nor to his former best friend, whose torments have driven him to consider committing the unthinkable. But to his four friends: a Humphrey-Bogart-obsessed neighbour, a teenage violin virtuoso, a pastor's daughter and a teacher.

Most of the time, Leonard believes he's weird and sad but these friends have made him think that maybe he's not. He wants to thank them, and say goodbye.