It's more young adult puzzlehunt fiction, so you won't impress your grown-up friends for having read this. But it was fun! A group of friends at a NYC catholic school team up to solve a long-forgotten birthday treasure hunt. They take the hunt kind of slowly—they'd figure something out and then wait until the next morning to follow up on it. But that's what happens when you have the clues from a decades-past treasure hunt. "Oh, we can't go into that church now, it's closed for the night." It was cool to see how the characters worked together to solve the puzzles.