Halo Master Chief and the Composer's Abyss

"The legendary Master Chief, Spatan John-117, returns to duty eight months after saving Earth for the second time. Through his stalwart ally, the artificial intelligence Cortana, was lost in the cataclysmic final battle, the Master Chief is reunited with his fellow Spartan-II super-soldiers on Blue Team--Fred-104, Kelly-087, and Linda-058. Soon enough, a distress call brings Blue Team face-to-face once more with one of humankind's most implacable enemies, an unimaginably powerful foe the Master Chief believed to be defeated: the Didact!"--Back cover.