Five students land in detention at Bayview High, and one of them, Simon, the kid who runs a notorious gossip app, collapses and dies before it ends. Police soon decide it was no accident. Simon had damaging posts queued up about each of the other four, which turns a straight-A student, a popular girl, a baseball star and a kid on probation into suspects and then into tabloid fixtures.
Karen M. McManus tells the story through four rotating first-person narrators. Each chapter is short and usually ends on a small hook, so the pages move quickly. The setup borrows The Breakfast Club's stereotypes on purpose, then spends the book taking them apart. Each suspect turns out to have a private life far messier than their reputation, and the investigation forces them to decide whether to trust one another. Alongside the mystery are family pressure, first romance, online pile-ons and the way news coverage flattens real people into easy villains.
Reading it feels like bingeing a teen drama. The prose is plain and the dialogue is natural. It plants enough clues for attentive readers to play detective. It isn't a deep or literary book, but it is very good at making you want one more chapter, which is a big part of why it became a bestseller and spawned sequels and a TV adaptation.