The Sable Quean is the 21st novel in the Redwall series by Brian Jacques, and the last to be published before his death on February 5, 2011 (a twenty-second novel, The Rogue Crew, was released in May 2011). It is illustrated by Sean Rubin. It was to be originally released in autumn 2009, but the release date was moved to January 2010, and then later delayed a second time to February 23, 2010. The mass market paperback edition was released on April 26, 2011.