On UrbanMyth, 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. 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?

After suffering an epic tumble down the corporate ladder, Cassie Woodson takes a thankless temp job reviewing correspondence for a large-scale fraud suit. While sorting through a relentless deluge of emails, something catches her eye: the tender (and totally private) exchanges between a partner at the firm, Forest Watts, and his enchanting wife, Annabelle. By peeking into their apparently perfect life, Cassie finds renewed purpose and happiness. But when she orchestrates a “chance” meeting with Forest in the real world and sees something that throws the state of his marriage into question, the fantasy she’s been carefully cultivating shatters. Suddenly, she doesn’t simply admire Annabelle --- she wants to take her place. And she’s armed with the tools to make that happen.