It's been three months since the colony world of Meridian was invaded by the alien alliance known as the Covenant. Under the close watch of the military, Evie, Dorian, Saskia, and Victor have been put into an accelerated training program with ONI, the Office of Naval Intelligence. And to the teens' surprise, ONI has a mission for them: return to their hometown on Meridian and monitor the Covenant's efforts to retrieve an ancient Forerunner artifact...

After his return from space, Gabe is trying to find a new life for himself after being presumed dead-just as Alex and Chase are trying to relearn how to live and work without him. But when a seemingly alien artifact goes missing from Gabe's old collection, it grants the group a chance to dive into solving the mystery of its origins as a team, once again. When a lead on the artifact is tied to a dead pilot's sole unrecorded trip, another clue seems...

"A hundred millennia has passed since the events of Iron Gods. The Spin is dying, and its few inhabitants live unknowingly in the relative paradise of one of hundreds of Virtual Realities--'vrealities'--or they scrape a living out of remains of the real world. As the vrealities drain the last resources of the Spin, a rebellion which could kill millions sparks and gains momentum. In a remote star system, an ancient insectoid called Skarbo the Horologist...