Template:Ratings Tor Books is a publisher that publishes some of the Halo books and many other fantasy books. It is a part of LLC which publishes popular fiction, and is particularly noted for its science fiction and fantasy titles. Tom Doherty Associates, LLC, was formed by Tom Doherty in 1980, and sold to St. Martin's Press in 1986. Along with St. Martin's Press, Henry Holt, and Farrar Straus Giroux, it is now part of the Holtzbrinck group.
In March 2006, Tor began releasing DRM-free ebooks through Webscriptions, but Holtzbrinck pulled the project within days of it starting, over Tor's objections.
Tor has a three-book contract deal with Bungie. The first book, Halo: Ghosts of Onyx by Eric Nylund, was released on October 31, 2006. The second book was Halo: Contact Harvest by Joseph Staten, which was released on October 30, 2007. A sixth novel, Halo: The Cole Protocol will be released fall 2008 .