Blood Night: The Legend of Mary Hatchet

Blood Night The Legend of Mary Hatchet is a 2009 horror film written and directed by Frank Sabatella, and cowritten by Elke Blasi.

In 2008, a group of teenagers prepare for their Blood Night party by holding a sance at Marys grave at a cemetery on Sweet Hollow Road in Huntington, where they are told one of the stories relating to her by the cemetery caretaker, Gus, a former Kings Park employee who claims that Mary will keep coming back to kill until she finds her child, who was buried in a shallow grave near Kings Park. The teenagers proceed to party at a house, where straggling guests are killed by an unseen murderer amidst supernatural occurrences.The remaining teenagers flee when they uncover their friends bodies, and run into Gus. After hearing the teenagers story, Gus has them accompany him to the abandoned Kings Park Psychiatric Center, where they dig up the grave of Marys baby, Gus being convinced that reuniting mother and child will appease Marys spirit. The babys casket is empty, so the group break into Kings Park in search of answers, and discover paperwork that reveals that Marys child is Alissa, a missing party guest visiting from Chicago. A series of flashbacks show that Alissa killed everyone either due to being influenced by Mary, or because she is experiencing the onset of a disorder similar to her to mothers. ........

Source: Wikipedia