Long Island, 1978: A young girl named Mary Mattock gruesomely murders her family with a hatchet and is locked away for life in the notorious Kings Park Psychiatric Center. Ten years later, Mary escapes from the asylum, leaving a grizzly trail of bodies and blood in her wake. Gunned down by the police, she meets her own demise outside the sanitarium walls. So began the legend of Mary Hatchet's walking ghost and the night named in honour of her death, Blood Night! Stemming from this real-life legend, 'Blood Night The Legend of Mary Hatchet' tells the tale of a group of teenagers enjoying their annual Blood Night festivities, when they come face to face with the reality of this haunting legend. One by one, the teenagers disappear and meet their fate. As the body count rises, so do questions about their missing friends and the secrets of Mary's horrifying past Is there more to this legend than the vengeful ghost of Mary Hatchet? And if so, who will survive to tell the terrifying tale?