Supernatural horror about a group of college students who are terrorised by malevolent supernatural being The Bye Bye Man (Doug Jones). Trouble begins when the three friends move into an old house together off-campus. There, The Bye Bye Man begins to stalk them and appears whenever they say his name or even dare to think about him. Their investigations into the history of The Bye Bye Man lead them to believe he may be responsible for possessing a number of historical murderers and forcing them to carry out their killing sprees. Meanwhile, he enters their minds and grows in power the more they think about him. They decide the only way to get rid of the evil entity is to try and forget about him and keep his existence a secret for all of time, but can they first save themselves and stop others from being hunted by The Bye Bye Man?