Blackwater Lane follows the story of Sarah, the woman who encounters the stranded motorist. After seeing the motorist on the side of the road, Sarah decides not to stop and instead drives home, feeling guilty about not helping. However, when the news reports that the motorist was found dead, Sarah is haunted by the fact that she could have been the last person to see him alive.
As Sarah grapples with her guilt, she starts experiencing strange and terrifying events. She receives mysterious phone calls and notices a suspicious car following her. Feeling paranoid and threatened, Sarah becomes convinced that she is being targeted by the same person who murdered the motorist.
As the fear and tension escalate, Sarah embarks on her own investigation to uncover the truth and protect herself. She delves into the victim's background and attempts to connect the dots, all while dealing with the emotional toll of the situation. Along the way, Sarah uncovers shocking revelations and finds herself in a race against time to outwit the killer and save herself from becoming the next victim.
The movie delves into themes of guilt, paranoia, and survival as Sarah navigates a terrifying and dangerous situation. The suspenseful and gripping narrative keeps audiences on the edge of their seats until the climactic showdown with the killer.