Observance (2016)

Plot

Struggling with the loss of his son, a crumbling marriage, and financial despair, Parker reluctantly takes on a job as a private investigator. His assignment involves watching a woman from a vacant apartment, but as he observes her, he becomes entangled in a series of unsettling events. Unbeknownst to Parker, the dilapidated building he’s stationed in harbors a sinister force that begins to close in on him, amplifying his grief and pushing him toward the brink of madness.