The Hagstone Demon is a 2009 American supernatural horror film directed, co-written, co-produced, photographed, and edited by Jon Springer.

The film stars Mark Borchardt as an alcoholic writer and caretaker plagued by demonic forces, with Nadine Gross, Cyndi Kurtz, Sasha Andreev, and Lung Leg in supporting roles.

[1] Burned out from his career as an investigative reporter and devastated by the suicide of his wife, Douglas Elmore decides to take a job as the temporary caretaker of a dilapidated apartment complex called "The Hagstone."

The next day, Douglas goes about his duties in a state of post-coital euphoria, until he discovers Mrs. Brennan’s bloody corpse in the rear stairwell of the building.

Determined to clear his name and to protect Julie, Douglas confronts Karna and accuses her of the murders, yet succumbs to her overwhelming sexual power.

Karna slips a mickey into Douglas’ drink and whisks him away to a bizarre satanic sex ritual that culminates in a human sacrifice.

The film was awarded the "Best Feature" prize at the 2009 Atlanta Horror Festival[3] and received positive reviews in various horror-related media outlets.