Woman calls police after invisible force drowns her

In a secluded seaside town, a grieving woman fleeing a sudden tragedy must fight for her survival when she senses a presence pursuing her.

After nearly drowning in a lake, a young girl develops an abnormal fear of water and is plagued by visions of a mysterious dark figure. A year later, in an attempt to cure her phobia and visions, her skeptical friends stage a séance and subject her to a bathtub experiment, unwittingly summoning the dark figure into the world.

After a woman dives into a shallow river, she surfaces only to have no memory of where she is, how she got there, and how she will get home.