A Marine Biologist is assigned to investigate the mysterious deaths of marine life in an inland salt water lake that have been attributed to a creature thought to have been the stuff of legend.

While investigating the murder of her father by her blind younger brother, a young woman disturbs the vengeful spirit of Elizabeth Short, known in legend as "The Black Dahlia".

As Alyssa and Karla try to escape from the church home that holds them captive, Karla is slaughtered by a vicious, semi-human creature. After Detective Kimball tracks down Alyssa at a rowdy biker bar, she tells Kimball that women inmates disappear every full moon, and shows him the silver bullets in her gun. Now the two must return to the halfway house to confront the priest and nuns—and the snarling, savage evil—that dwell within.