When five students file into detention at Bayview High — Bronwyn the overachiever, Addy the prom queen, Nate the criminal, Cooper the athlete, and Simon, the outcast who runs the school's notorious gossip app — only four walk out alive. Simon dies from an allergic reaction that looks less and less like an accident, and the police quickly zero in on the four students left in the room: each of them was about to be exposed by one of Simon's next posts, and each had a reason to want him silenced.
As the investigation drags on and the media descends, the four suspects are forced into uneasy alliance, piecing together what really happened even as the secrets Simon meant to reveal threaten to come out anyway — from each other, if not from him. Told in alternating first-person chapters, One of Us Is Lying is a fast-paced YA mystery about the personas built to survive high school and what happens when they start to crack.
Karen M. McManus's bestselling debut launched a series and was adapted into a television show, and it remains a touchstone of the modern YA thriller boom.