The Bye Bye Man.

PLOT

In the late 1960s, a mass murder occurs in which a man kills people on his block. As he shoots the neighbours, he continuously asks if anyone spoke about "the name" which cannot be said. He also repeats the same thing over and over again. "Don't say it", don't think it, don't say it."

In the present day, Elliot(Douglas Smith), his girlfriend Sasha(Cressida Bonas) and best friend John(Lucien Laviscount), move into an off-campus house not far from their college. Soon, mysterious things start to happen, such as Sasha developing a strange cough and Elliot finding coins in a nightstand that continually reappear. Elliot also finds writing consisting of  "don't say it", don't think it, don't say it", and ultimately a name: the Bye-Bye man. During a sentence involving their friend Kim(Jenna Karnell), the name is mentioned.

Sasha continues to become sick as Elliot and John start experiencing hallucinations and stranger activity. Elliot begins to suspect that Sasha is cheating on him with John. Elliot's brother, Virgil(Michael Trucco) also becomes suspicious. As Elliot investigates, Kim is killed after she is struck by a train. Elliot is taken in for questioning by Detective Shaw(Carrie Ann-Moss), but he manages to avoid potential incarceration when Kim's suicide note revealed she killed her room mate and was planning on killing Elliot, Sasha and John.

Mrs. Watkins, the librarian, shows Elliot a dossier detailing more information about the Bye-Bye Man: a teenager killed his family and told a reporter the Bye Bye Man made him do it. The same reporter who investigated this later became the mass shooter during the '60s, who killed himself soon after realizing people knew about the Bye Bye Man. Elliot also visits the widow of the reporter, who reveals that the curse causes insanity, hallucinations, and eventually death. Signs of his coming are coins mysteriously appearing, sounds of a train, and a large skinless hound;"Don't say it, don't think it" is a way to avoid him. The only way to prevent it is to not think of his name or speak of him. If someone already knows, they must be killed, and the first one to know must end their life as well. Mrs. Watkins is hit by Elliot's car by accident, who beforehand, had killed everyone in her home and was coming for Elliot next. He limps home after escaping the wreckage to protect Sasha while using a new strategy to not fall for the hallucinations in order to decrease the power of the Bye Bye Man.

Meanwhile Sasha and John are also suffering from the hallucinations: she sees John as Elliot, and John sees Sasha as the corpse of Kim. Elliot gets home and finds John stabbing Sasha. He shoots John after fighting him back, but after Elliot picks up the corpse of John again, it is revealed to have been Sasha that was stabbing John; therefore Elliot killed Sasha.

The Bye Bye Man soon appears, and provides Elliot a hallucination. He gets to the front room, where Virgil and his daughter Alice are on the other side of the door. Elliot keeps them away long enough for him to shoot himself with a gun. Virgil and Alice get away before the entire house goes up in flames. 

While riding home, Alice reveals she found the coins from the nightstand being near the trash, along with the writing within it. However she could not read it due to her poor night vision. Detective Shaw arrives at the scene as well, where John is found to be alive but wounded. He whispers "Bye Bye" into her ear, hinting that the curse is going to start all over again.