Mass Effect: Revelation is a prequel novel to the Mass Effect trilogy, by Canadian science fiction writer and lead writer of the Mass Effect video game, Drew Karpyshyn. First published in 2007 by Del Rey Books, it is the first novel set in the Mass Effect universe. The book serves to fill in much of the background details of the game, such as locations (including the Citadel), the internal politics of the Council races, and some of the science involved, as well as introducing characters such as David Anderson. A considerable amount of the plot revolves around the galaxy's views on artificial intelligence, as this is a major plot point in the game. It also sets up the game's main villain, Saren Arterius, and how he came to be involved in the events sparked by Sidon. The book is featured in Mass Effect 2 as a purchasable souvenir at the Zakera Cafe. The book's description in-game says that it is a military history novel detailing Saren's early missions before the events of Mass Effect.