UrbanMyth: It was lauded as an alternative to the performative, show-your-best-self platforms—an anonymous discussion board grouped by zip code. The residents of Manhattan’s exclusive Upper East Side disclosed it all, things they would never share with their friends or their spouses: secret bank accounts, steamy affairs, tidbits of juicy gossip. The same people who, as parents, go to astonishing lengths to ensure that their children gain admission to the most prestigious boarding schools and universities. So when a “hacktivist” group breaks into the forum and exposes the real identity of each poster, the repercussions echo down Park Avenue with a force that none could have anticipated. And someone ends up dead. Is the murderer Heather, the outsider who would do anything to get her daughter into the elite’s good graces and into their even better schools? Norah, the high-powered executive failing to balance work with the emotional responsibilities of motherhood? Or Poppy, whose perfect-on-the-outside façade conceals more than her share of secrets? Each of them has something to hide. Each of them will do anything to keep secrets hidden. And each of them just might kill to protect their own.