Superior Saturday is by Garth Nix. The sixth book in the Keys to the Kingdom series. Arthur returns to the House in search of the sixth key. He tries to hide from everyone the fact that he is becoming a Denizen and less human with every adventure. This time he's up against Superior Saturday, a powerful sorceress, whose goal is to get into Lord Sunday's gardens and escape the Lower House altogether. Fans of the series will not be able to wait for the finale. Be warned, this is not a series you can pick up in the middle and comprehend. It needs to be read from beginning to end in order.
Ratings: 7th grade - 8 out of 10.