Long before "Twilight" put Jacob on the map, werewolves have been the subject of countless movies, books and monster tales. Dating as far back as the ancient Greeks, werewolves and other shapeshifters ...

No callers are identified. No conversations are recorded. No phone records are kept. Now speak clearly and when you are finished say: 'Go ahead'.

Wildlife cameraman Max Hug Williams and naturalist Adrian Shine embark on a mission to discover the phenomenon hiding behind a recent string of werewolf sightings in Brazil.