Darth Bane: Rule of Two is the follow-up novel to 2006‘s Darth Bane: Path of Destruction. It was a replacement for the then-canceled Darth Plagueis novel. It recounts the story of Darth Bane and his apprentice Darth Zannah after the Seventh Battle of Ruusan.
A preview of Rule of Two is available in the paperback release of Allegiance, released the same day as Rule of Two. The paperback was released on October 28, 2008. The paperback has an excerpt of the Millennium Falcon novel.