Cold Trap by Jon Waskan

Miles from the multinational Unity lunar outpost, a lone explorer extracts a mysterious object – a missing chapter from the primordial past – from deep beneath the grime ice in the never-ending darkness of crater 6L43A. Inexplicably, the explorer vanishes, and the object along with him. Nearby, the gears spin on a secret device, setting in motion a chain reaction that could avert a civilization-ending cataclysm. Known only to a select few, the machine must be protected. But watching from the shadows, a brilliant sociopath has plans of his own. . .