Novelizations of four of the five films; Genesis, Apocalypse, Extinction, and Retribution, were written by Keith DeCandido, while Retribution was written by John Shirley, though Afterlife did not receive a novelization. The Genesis novel was published over two years after that film's release while the Extinction novel was released in late July 2007, two months before the film's release. There was also a Japanese novelization of the first film, unrelated to DeCandido's version, written by Osamu Makino. Makino also wrote two novels based on the game Resident Evil: The Umbrella Chronicles. The books are a two-part direct novelization of the game and have been published in Japanese and German only. The first novel which was titled Biohazard: The Umbrella Chronicles Side A in Japan and Resident Evil: The Umbrella Chronicles 1 in Germany was released on December 22, 2007. The second novel which was titled Biohazard: The Umbrella Chronicles Side B in Japan and Resident Evil: The Umbrella Chronicles 2 in Germany was published in January 2008.