Halo: The Cole Protocol

In the early days of the Human-Covenant War, the Cole Protocol is humanity's most critical operational security measure — destroy all navigation data before it can lead the Covenant to Earth. Navy Lieutenant Jacob Keyes is assigned a classified mission deep behind enemy lines, to a gas giant's asteroid belt where an impossible thing has happened: humans and Kig-Yar have formed a fragile, unexplained alliance. Tobias S. Buckell's sixth Halo novel fills in the war's early history while establishing key characters across multiple factions.

Jonathan Davis brings the same controlled, authoritative narration he applies to other Halo extended universe entries, his voice handling the novel's multiple perspectives — UNSC, Insurrectionist, Covenant — without losing the narrative's threading. At just under ten and a half hours, The Cole Protocol is one of the more accessible Halo expanded universe novels, its political complexity grounded in a tightly structured story. A strong entry for new and established series readers.