Out beyond the Outer Colonies lies the planet Hesiod, a gas giant surrounded by a vast asteroid belt. As the Covenant continues to glass the human-occupied planets near Hesiod, many of the survivors, helped by a stronghold of human Insurrectionists, are fleeing to the asteroid belt for refuge. They have transformed the tumbling satellites into a tenuous, yet ingenious, settlement known as the Rubble-and have come face-to-face with a Covenant settlement of Kig-Yar . . . yet somehow survived.

News of this unlikely treaty has spread to the warring sides. Luckily for the UNSC, this uneasy alliance is in the path of the Spartan Gray Team, a three-man renegade squad whose simple task is to wreak havoc from behind enemy lines in any way they see fit. But the Prophets have also sent their best-an ambitious and ruthless Elite, whose quest for nobility and rank is matched only by his brutality. . . and who will do anything to secure his Ascendancy and walk the Path.