The Glass Horizon part 1: An action-packed survival tale on the treacherous and barren glasslands of a Covenant-ravaged colony world . . . and a Spartan-IV's mysterious origin revealed in this two-part thriller by Duffy Boudreau (_BlackAcre_) and Douglas Franchin (_Person of Interest_). The beginning of a new arc in the _Halo: Escalation_ series!