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From the liner notes

In The Dark Lurking, something has gone terribly wrong at Outpost 320. One mile beneath the Earth, all communications and all means of escape have been destroyed, and an extremely dangerous horde of ancient creatures is on the loose after a doorway to unspeakable evil has been opened. Eight survivors—two former research patients, three mercenaries, two researchers, and a medic—barricade themselves inside a remote area of the facility with little food, almost no ammunition, and little hope of rescue. Their one possible escape route is through thirteen levels of terror that will lead them to the surface. However, one of them is not who they seem to be, but actually The Dark Lurking in human form.