
It's historical fiction - Choldenko has done a lot of research to ensure that the details of the 1930s time period she is writing about are accurate, particularly with respect to the operation of the prison. The point of the title is that Al Capone is an inmate at the time of the action and there are all sorts of rumors circulating about him that both scare and captivate the kids who are the main focus of the story. There is a sequel to this book - Al Capone Shines My Shoes - that is an equally good read, particularly for a young male audience. The characters and situations are whimsical in both and, although there is some intrigue and suspense, there's nothing to raunchy or dangerous going on. Both books are great summer reads for young and older readers alike.