Halo 4 Spartan Ops continues here as the UNSC Infinity battles the Covenant for control of the all-powerful Forerunner Janus Key. Plus, Spartan Tanaka"s thrilling origin story revealed--all in this volume collecting Halo: Escalation issues #13-#18 by Duffy Boudreau (Blackacre), Sergio Ariño (Ms. Marvel) and Douglas Franchin (Person of Interest).