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The New York Times bestselling author returns with an unsettling but riveting psychological thriller about a captivating woman who joins a family and threatens to upend their picture-perfect lives. Summer's looking forward to a break from hustling for acting work in Manhattan when she, her husband Gabe, and Gabe's nine-year-old son come to rural Pennsylvania for the annual family get-together at her in-laws' sprawling estate. On the agenda are leisurely gourmet meals, tennis games, and plenty of relaxation by the pool. This year, Gabe's baby brother Nick, a perpetual bachelor, has invited his new flame Hannah, who's an actress as well. In fact, Summer immediately recognizes Hannah from a showcase they once did together, but strangely, Hannah claims not to know her.