Gamespot is reporting that the latest Halo novel, Contact Harvest, has dropped to number 4 on the New York Times Best Seller list. The novel debuted at number 3 last week.

From Wikipedia:
Halo: Contact Harvest is a novel by Joseph Staten, set in the Halo universe. Staten is a longtime employee Bungie Studios, the developer of the Halo video game series. He was the director of the cut scenes seen in the Halo series thus far and was a major contributor to the Halo storyline which continues in this book. The book was released on October 30, 2007, and is the fifth novel set in the Halo universe.

Set in 2524, 28 years before the events of Halo: Combat Evolved, the novel tells the story of the United Nations Space Command’s first encounter with the alien Covenant on the colony world of Harvest. It is an ‘ensemble piece’ covering many different viewpoints, focusing on the young UNSC Staff Sergeant Avery Johnson also containing a major Covenant presence as well.