One Of Us Is Lying (Taschenbuch) von Karen M McManus

Five students at Bayview High walk into detention. Bronwyn, Addy, Nate, Cooper, and Simon, the creator of Bayview High's notorious gossip app. Only, Simon never makes it out of that classroom. Before the end of detention, Simon's dead and it wasn't an accident. He'd planned to post juicy reveals about all four of his high-profile classmates, which makes all four of them suspects in his murder.