The invisible alien force of Zeta Minor's relentless persecution of the expedition members, leading to disappearance and death as they trespass on sacred territory.

Sorenson’s obsessive refusal to abandon his mining efforts leaves the team stranded as night approaches. While Braun remains outside to investigate an unnatural sound, the planet’s invisible force seizes him …

Baldwin’s warnings of peril fall on deaf ears as the expedition base trembles with the planet’s hostile energy. Before he can finish calling for Sorenson and Braun, the air itself …