Trapped in a violent, abusive relationship with a wealthy and intelligent scientist, Cecilia Kass manages to escape in the dead of night and disappear with the help of her sister, a childhood friend, and his young daughter. But when Cecilia's cruel ex-boyfriend commits suicide and leaves her a large portion of his vast fortune, she suspects it's a trap. A series of strange coincidences turn deadly and threaten the lives of those she cares about. Her sanity begins to unravel as she desperately tries to prove to those around her that she is being hunted by an invisible presence that haunts her.