Nate, Bronwyn, Addy, Cooper, and Simon all study at Bayview High and are coincidentally put into detention together, unknowing that it will take their lives upside down. While all of them walk into detention in good health, one of them turns up dead, thereby inviting an investigation. It is soon confirmed beyond doubt that Simon passes away due to a deadly allergic reaction, but his death is not an accident. Allegedly, one of the four students with him in detention is responsible.
Since Simon was well-known for originating an online gossip app that would publicize some life-changing secrets about his classmates, all four students are observed to have a motive to kill him. But who went ahead and committed the unforgivable crime?