Olivia Barron is a college senior who is seen by others as a good girl who always puts others’ needs before her own. During her last spring break, although she initially plans to build houses with Habitat for Humanity, her best friend Markie Cameron convinces her to come to Mexico with their friends instead. At a bar, Olivia meets a man named Carter who invites them to go drinking at an abandoned church. There, Carter suggests they play truth or dare. During the game, their friend Tyson Curran reveals that Olivia has a secret crush on Lucas Moreno, Markie’s boyfriend, which she denies. Carter admits that he tricked them into playing a supernatural version of the game and warns them to do whatever the game asks or they will be killed. Back at school, Olivia sees hallucinations calling on her to pick truth or dare. She picks “truth” and blurts out that Markie has been serially unfaithful to Lucas. The friends learn that Ronnie, another friend, was forced to kill himself after failing to complete a dare. Lucas picks “truth” and admits that he has always had feelings for Olivia. Markie is forced to break Olivia’s hand while their closeted friend Brad Chang is forced to admit to his father that he is gay. Olivia, Markie, and Lucas find Sam and force him back to the ruins of the church. As Sam goes through the ritual to trap Calux, Lucas is dared to kill either Olivia or Markie. When he refuses, Calux possesses him and forces him to kill himself after killing Sam so that the latter cannot complete the ritual. When Markie’s turn comes, Olivia tells her to choose dare, then refuse to complete it. Calux possesses Markie, at which point Olivia forces Calux into the game by asking him to pick truth or dare. The demon is forced to tell the truth that there is no way they can make it out of the game alive because Sam is dead. They’ll die unless they add more people to delay their next turn. Olivia uploads a YouTube video, in which she briefly warns viewers about the game and its rules. She then asks “Truth or Dare,” involving whoever hears the phrase into the game, delaying her and Markie’s next turn for the time being.