Top Secret Underground Facility Went Dark. Something Below Sub-Level 9 Is Climbing Up

Nineteen hours after a buried containment facility goes silent, Investigator Callahan descends into a vault where every door is open and the surviving guards insist containment is still holding.

The four men left alive move by inches, testing each step with chicken feathers taped to wooden rods. Invisible planes cut through steel and flesh without sound. The only thing keeping the lower levels sealed is a forbidden bargain with a nonhuman holding, paid for in iron stripped from the facility itself.

Callahan was sent to determine who broke doctrine and authorize the punishment...