Halo 4's 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 Ario (Ms. Marvel), and Douglas Franchin (Person of Interest).