This series is so much fun for bibliophiles and young readers. Adventures in books - what more could you want?! The Book Smugglers is the fourth book in the series and this book opens with Tilly's grandfather being magically poisoned by a book. He's been catatonic for weeks and they have no idea how to cure him. When Horatio, the driver of the magical train The Quip, and his nephew Milo show up on their doorstep wanting to barter a cure in return for Tilly's help, they feel they have to take it. But when Horatio accidentally touches the book and becomes poisoned himself, it's up to Tilly and Milo to try and figure out what to do. There only clue lies in The Wizard of Oz. A fun continuation that ends on a cliffhanger. I can't wait for the next one! ( )