After dropping his siblings into an alley in Dallas — in different years — Five scrambles to track them all down and stop a new doomsday threat.

An old friend taunts Holden with the answers he seeks. Naomi struggles to fit in. A mysterious low-level tech aboard the Thomas Prince enacts a terrifying plan.

All eyes turn to the edge of the solar system as a mysterious new presence emerges; Naomi recommits to her roots; Drummer butts heads with a seasoned new commander aboard…