Earlier than you can say “allow notifications,” a group of teens download the dead app and go straight beyond these annoying terms and restrictions of use. “It`s just an app!” one of them who has already moved on to another form of recklessness. But if the countdown turns out to be real, the software company will be held responsible and an investigation will be opened. Quinn Harris, a nurse who works in the hospital where an injured Evan is admitted, is often sexually touched by her boss, Dr. Sullivan, but is afraid to speak out because he is new. Evan tells him about Courtney and her suspicions about the app. It also reveals that it is said that he will die by the time he is operated. Quinn rejects his claims, but eventually downloads them. She is horrified to learn that she is only three days old. Evan skips his operation and is informed that he has violated the User Agreement. When she returns home, she is attacked and killed by an invisible being when her timer reaches zero.
Quinn announces a plan to date her younger sister Jordan and her father before being informed that she has violated the User Agreement. She researches the app, learns courtney and that other app users have had similar things, but are considered fake. Panicked, she buys a new phone, but finds that the countdown app has settled on it. After being attacked by a demonic character, she meets Matt, whose countdown says he will die a few hours before Quinn. .