There is hunger in the forest at night. It is the witching hour of stealth and surprise, when wolf packs hunt their prey. Using a natural calculus of speed and distance, wolves drive their quarry deep into the snow. The chases end with an assault of teeth and snarls. Learning what's beyond the menace is not for the faint of heart. But Shaun Ellis and his girlfriend Helen Jeffs are willing to risk their lives and leave behind the last remnants of a human existence to survive in the world of the wolf. It's almost like the wolf brings out a subconscious in you, a way of dealing with the world," Ellis said. But to do so, Ellis and Jeffs have to become wolves themselves. "Lose your human, think wolf," Ellis said to Jeffs. It is a skill he has honed in the last few decades. He has done what many scientists thought impossible and has become an accepted member of a captive wolf pack. "This is the way that you need to study these animals. Get close to their world. And then they will share their secrets," he said. As a man living among wolves, Ellis bade farewell to the comforts of human society and took his place on the ground to learn the ways of a canine hierarchy. He created his own sanctuary to study captive wolf behavior at the Coombe Martin Wildlife Park, on England's southwest coast. His goal is to find ways for wolves to peacefully co-exist with ranchers whose cattle are susceptible to attack. At a nearby pub one night, he met a woman who discovered she was fascinated both by the wolves and the man living among them. Jeffs became Ellis' assistant. And later on, something more.