Mary, Mary, Bloody Mary

In this 1975 Mexican horror film, American artist Mary Gilmore's life takes a dark turn when her van breaks down in rural Mexico, leading to a series of gruesome murders and a revelation that she is a vampire. As the body count rises, Mary must confront her own supernatural nature and the possibility that she may be responsible for the slaughter. A complex web of intrigue and suspense ensues, involving art dealers, law enforcement, and a mysterious masked killer, all leading to a shocking twist: Mary's own father is revealed as the true monster.