This is a YA book very much in the spirit of Charlie and the Chocolate Factory; a group of 12 kids are trapped in a library and have to solve riddles to find the way out and win the prize from the wealthy and eccentric billionnaire owner, Mr. Lemoncello. It's a fun read and a fond look at a lot of good books, which is great; the appendix includes a list of all the books referred to within this one, for kids who are interested in following up more. Would recommend for readers in the 8-14ish age group! (The kids in the story are 12.)