Dublin 1912. An unusual earthquake hits Dublin. Since that day no ship, mail or telegraphs reach Ireland from the outside world. Meanwhile an archaeologist, Jim, is invited by his friend Jane to her gallery of ancient rarities. Jane shows Jim a photo of an unknown cave painting, Jane's confession of having received the photo by mail from an unknown sender, leads Jim to a quest in search for the ancient graffiti. The Giant Deer is an original giallo Italian style.