Kyle Keeley is a huge fan of all games - board games, word games, and particularly video games. His hero, Luigi Lemoncello, the most famous and creative gamemaker in the world, is the genius behind the town's new library that is as much a home for tech and trickery as it is for stories. Kyle wins a spot at a puzzle-packed lock-in on the library's opening night. But when morning comes, the doors stay locked. Kyle and the other kids must solve every clue and figure out every secret riddle to find the hidden escape route.