Superior Saturday is the sixth novel by Garth Nix in his The Keys to the Kingdom series. It follows the pattern set by the five previous novels (i.e. Arthur has to deal with the removal of the sixth Trustee of the Architect and her Will, Superior Saturday). Superior Saturday, like many books of the Keys to the Kingdom series, was first released in Australia, being released in early June 2008. The expected release date was July 1, 2008 in the United Kingdom (however people who pre-ordered with Amazon received their copy a day early), and August 1, 2008 for the United States. However Barnes & Noble released it on Monday, July 7.