Halo 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 Arino (Ms. Marvel) and Douglas Franchin (Person of Interest).