There is something in the dark. Billy can hear it, and knows it's coming for him.

Following a power outage, Billy sends his wife and son to stay with family whilst he awaits the arrival of the man from Trans- Energy to come and restore power to their isolated country home. Darkness draws near, and with it comes the engineer– a giant of a man who calls himself ‘Grant’. 

Billy lets the man into his home, only to find that he is anything but normal. Without power or contact with the outside world, Billy is forced to deal with the extreme mental and physical torture from the increasingly unstable and volatile engineer, and is forced to go to the most extreme lengths in order to try and survive.