The crew of Shackleton moon base is being hunted and killed. Mining operations are being destroyed, tourists killed, and all evidence points to an engineer who's gone mad, using a human-controlled robot to go on a murderous rampage. Or is he? No matter what this top-notch crew tries, the death and destruction continues. How can one engineer outwit the entire base crew? How has he managed to make his equipment do the impossible? As the situation grows more desperate, plan after plan fails to slow him and his killer machine down. As the deaths and destruction mount, as all of their attempts to stop him fail, there are forced to consider a more sinister option. What if something else is doing the killing?