Millions of people around the world claim to see UFO's and to be visited by aliens. Thousands claim they have witnessed strange and bizarre animal mutilations. What is the truth? Is there a link between the UFO and alien sightings and the barbaricacts carried out on cattle and pets across the world? Clayton Hall has spent many years investigating these terrible atrocities and has compiled huge amounts of data. What does he make of the global phenomenon? Are we jumping to conclusions about the cause? Is there a natural answer? Or is it the work of man? Could it be that for some reason alien life forms are visiting Earth and mutilating our animals? Why? A fascinating look into the heart of the mystery.