Plot

A young woman is followed by an unknown supernatural force after a sexual encounter.

For 19-year-old Jay, autumn should be about school, boys, and weekends out at the lake. But after a seemingly innocent sexual encounter, she is plagued by strange visions and the inescapable sense that someone, or something, is following her. Faced with this burden, Jay and her friends must find a way to escape the horrors that seem to be only a few steps behind.—Jose Tamayo

A young woman, Jay, goes on a date with a guy she hardly knows. They have sex, after which he informs her that there is a shape- shifting entity following him, and, now that he's made love to her, it will follow her. Soon Jay discovers that he is telling the truth. Her friends and sister don't initially believe her, but they are soon witnesses to the malevolent intentions of the sinister being.—grantss

After sleeping with a handsome stranger, Jay (Maika Monroe) quickly learns that she has inherited a most unusual curse: Wherever she goes, lumbering, half-naked phantoms follow, and their singular goal is to see her dead. Desperate, Jay turns to her younger sister and loyal circle of friends for help. In time, however, Jay learns that her only hope for escaping death is to sleep with someone else and pass on the curse. But the pursuing phantoms are invisible to Jay's friends and it soon becomes apparent that her time is running out. Now, with death closing in, the terrified young woman will be forced to make a difficult decision if she hopes to survive her terrifying ordeal..

In the opening scene, a young woman is fleeing from someone or something. She is shown driving to the beach. At the beach, she calls her father and tells him that she's sorry for being so unkind to him. In the morning, it is shown that she was brutally murdered during the night. Her leg is twisted and a bone is seen sticking out of it.

The film then switches to Jay (Maika Monroe) who is on a date with Hugh (Jake Weary) at the movies. While they are waiting in line, Hugh starts talking about how envious he is of young children and how they have innocent, carefree lives. When they are inside the theater, Hugh spots a young woman at the entrance. He points her out to Jay, but she, however, cannot see her. Suddenly, Hugh starts getting afraid and demands to Jay that they leave the theater.

On their next date, Jay and Hugh are having sex in his car, when he suddenly chloroforms her. When Jay awakens, she is tied up in a wheelchair. Hugh is there and he explains to her that when they had sex, he passed on a curse to her. This curse is an entity that can only be seen by the person with the curse (which is now Jay). The entity can take the form of any person and will follow her repeatedly at a walking pace. If IT catches her, it will kill her and will go after the previous person who had the curse (which would now be Hugh) to get them to pass the curse on to someone else.

Hugh says he got the curse from some girl he had a one night stand with. IT will continue to stalk Hugh until he passes the curse on to someone else, hence why he slept with Jay.

At that moment, Hugh spots a naked woman walking towards them. Jay and Hugh then flee. Hugh drops Jay off at home and continues to flee. The police are searching for Hugh, but are unable to find him.

While at school, Jay spots an old woman in a hospital gown walking towards her. Everyone around does not appear to notice the old woman. Jay's friend, Paul (Keir Gilchrist), who has a crush on Jay, and her sister Kelly (Lili Sepe) agree to help.

That night, Jay, Paul, Kelly and another friend, Yara (Olivia Luccardi), all agree to spend the night in the same house. During the night, Paul hears a noise and examines a smashed window in the kitchen. He looks around, but does not see anyone. Jay then sees an almost naked woman with dark eyes walking towards her.

She runs to tell the others, but none of them can see anything. Suddenly, a tall man with dark eyes walks into the room. Jay then runs out of the house.

Jay runs to a playground nearby, where her friends eventually catch up to her. A neighbor named Greg (Daniel Zovatto) offers to help the group by giving them a ride. Jay and her friends plan to confront Hugh, so after tracking him down by figuring out his real address, he insists on his original story, telling Jay that she needs to sleep with someone in order to successfully pass the curse on to someone else.

The group then goes back to Greg's house. Jay deduces that she needs to learn how to use a gun. While the group is sitting by the water, the entity takes on the appearance of Yara and begins to attack Jay. Jay flees and then IT takes the appearance of the tall old man and then Paul. Jay manages to shoot IT, but it does not die. Jay gets into a car and drives away, but she only manages to crash into a cornfield.

When Jay awakens, she is in the hospital being treated for her broken arm. Before she is released, Jay decides to pass the curse on to someone else. She sleeps with Greg in her hospital bed in hopes of successfully passing the curse on to him. Paul is heartbroken after finding out that Jay was with Greg.

At home, Jay looks out the window to see Greg walking down the street to his house. When he gets to his window, he breaks it and enters. Jay then figures out that IT has taken the appearance of Greg. Jay runs over to the house and peeks inside to see IT taking on the appearance of Greg's mom. Jay then tries to warn Greg, who is on the telephone. IT jumps on top of Greg and kills him. Now, the curse has reverted back to Jay, who flees to the woods.

When she awakens in the morning, Jay is near a beach and spots three young men on a boat. She undresses and goes into the water, hoping that she can sleep with one of the men and can pass on the curse to buy herself more time.

Back at home, Paul wants to sleep with Jay, but she rebuffs him, since she does not want him to be killed. Jay spots IT, posing as a naked man, spying on her from the roof. Paul then comes up with a plan to kill IT.

The group goes to a deserted swimming pool in hopes of luring IT into the water and then electrocuting it. Jay is the bait and gets into the pool. When she finally spots IT, it has taken on the appearance of her father. But, IT has figured out the plan and starts throwing electrical devices into the water to kill Jay. Since they cannot see IT, the others fire blindly to try to kill it. In the ensuing chaos, Paul accidentally wounds Yara, but then shoots IT in the head, supposedly killing the entity.

After heading home, Paul and Jay finally have sex. Paul then drives to a run-down part of Detroit where there are prostitutes walking the street. (The implication seems to be that the Paul plans to have sex with a hooker in order to quickly pass the curse to someone else...)

Sometime later, Jay and Paul are walking down the street hand-in-hand. Behind them, a person is following them.

THE END.