Based on the first of a trilogy by Tom Rob Smith and set in the Stalin era of the Soviet Union. The plot is about an idealistic pro-Stalin security officer who decides to investigate a series of child murders in a country where supposedly this sort of crime doesn't exist. The state would not hear of the existence of a child murderer let alone a serial killer. He gets demoted and exiled but decides, with just the help of his wife, to continue pursuing the case. Written by Arnold

A pair of documentarians head into the woods of the Exmoor countryside to find proof of the mysterious big cats that roam the area. But what they find in the depths of the forest is a horror beyond imagine. They must fight tooth and nail to survive or fall prey to what lurks in the darkness.