Terror arrives at the one place we all feel safest... When a wealthy woman, Chloe, and her stepson, Jacob, are targeted by a trio of expert thieves in their remote mansion, her only form of help comes from a call with Mike, a security systems specialist. But as the intruders become increasingly hostile and the connection wavers, will she trust him to be her eyes and navigate her to safety?

Mark 13 is a government-built killing machine programmed with artificial intelligence, able to repair and recharge itself from any energy source. Through a series of coincidences, the cyborg's head ends up in the home of a sculptress as a bizarre Christmas present from her boyfriend. Once inside its new home, the cyborg promptly reconstructs the rest of its body using a variety of household utensils and proceeds to go on a murderous rampage.