One of Us Is Next Novel by Karen M. McManus

Come on, Bayview, you know you’ve missed this.

A ton of copycat gossip apps have popped up since Simon died, but in the year since the Bayview four were cleared of his shocking death, no one’s been able to fill the gossip void quite like he could. The problem is no one has the facts.
Until now.
This time it’s not an app, though—it’s a game.
Truth or Dare.
Phoebe‘s the first target. If you choose not to play, it’s a truth. And hers is dark.
Then comes Maeve and she should know better—always choose the dare.
But by the time Knox is about to be tagged, things have gotten dangerous. The dares have become deadly, and if Maeve learned anything from Bronwyn last year, it’s that they can’t count on the police for help. Or protection.
Simon’s gone, but someone’s determined to keep his legacy at Bayview High alive. And the rules have changed.