The books just delve into the history of Spartans such as say, Lenny, who was the tallest, most handsome, strongest, fastest Spartan that slept with all the female Spartans and beat up all the male Spartans, (except for Master Chief who was his best friend) and was too busy defeating 100 scarabs and The Prophet of SUPERNESS during Halo 3 it was where all the action and important events happened but that doesn't matter did I mention he was the most handsome and had cornrows and blue eyes and a strong chin (written by a fat kid named Lenny and it somehow becomes official canon).