The Forerunner Saga is a trilogy of science fiction novels by Greg Bear, based on the Halo series of video games. The books in the series are Halo: Cryptum (2011), Primordium (2012), and Silentium (2013). The books were released in hardcover, e-book, paperback, and audiobook. Bear was given little restriction on the story of the novel; the Halo universe had not yet been explored in that time period. Cryptum received mixed reviews; some critics liked the Forerunner culture and suspense that Bear created, but others disliked the characters, found the plot too slow, and concluded that the novel was suited only to existing fans of the Halo series. Cryptum appeared on multiple bestseller lists after promotion on Halo Waypoint, a website that serves as a hub for Halo-related information. Primordium reached number seventeen on the New York Times Bestseller List in Hardcover Fiction. Silentium reached number eight on the New York Times Bestseller List for Hardcover Fiction. Source: Wikipedia (en)