This memorable book would make for a good YA crossover. 13 year old Oliver Dalrymple (nicknamed Boo) wakes up one day in heaven believing that he must have died from a complication due to his "holey heart." He later finds out that he was shot while standing by his locker at school, and when a fellow classmate turns up in heaven a few weeks later, they go on a quest to find the "Gunboy" who shot them. 
 Boo's heaven isn't what the reader might expect. It's populated only by 13-year olds who only stay there for about 50 years, at which point they disappear into their next afterlife (or perhaps they're reincarnated? No one really knows.) Everyone calls heaven "Town." God, who Boo refers to as Zig, sends shipments of various necessary items (food, clothing) that Town's residents will need to get by. Boo is disappointed that there aren't any science texts or other nonfiction available, and wonders where Town's drains drain to, or what happens to the items that go down Town's garbage chutes. 
 This novel has a lot to say about depression, mental illness, and bullying. It would make for a great discussion book for high schoolers or adults. It was something of a cross between The Curious Incident of the Dog in the Night Time and The Lovely Bones. I loved Boo's unique voice. 
 Digital ARC from NetGalley.