Sir Thursday by Garth Nix: Keys to the Kingdom Serires

This is the fourth book in the series.  Our central character, Arthur is back inside the house with all his friends.  This time he's been drafted in to Sir Thursday's army.  The adventure continues.  If you like funky out of the world stories, such as Alice in Wonderland, Or Wizard of Oz, then this series will take you to a crazy world where our rules really don't apply.  A whole different dimension, takes you to nothing you have experienced before. I would recommend this book to middle school and high school students especially to boys who like abstract worlds.