Book excerpt: Fighting escalates as the SPARTANS struggle to save humanity from the alien Covenant. Highlighting the talents of writer Duffy Boudreau and artists Douglas Franchin, Ian Richardson, and Sergio Ariño, this volume collects Halo: Escalation #13-#24, and features a cover gallery, annotations, and behind-the-scenes extras! One of the most popular video game franchises ever commences in an explosive saga following UNSC Spartan Commander Sarah Palmer and her team as they attempt to put a stop to Dr. Catherine Halsey and Jul M'dama's pursuit of the mysterious Forerunner artifact, the Janus Key--the fate of the entire galaxy depends on them