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"[A] taut, beautifully-written novel." - Sarah Pekkanen, #1 New York Times bestselling author of An Anonymous GirlFrom master of suspense Lisa Unger comes a riveting thriller about a chance encounter that unravels a stunning web of lies and deceit.Be careful to whom you tell your darkest secrets ... Selena Murphy is commuting home from her job in the city when the train stalls out on the tracks. She strikes up a conversation with a beautiful stranger in the next seat, and their connection is fast and easy. The woman introduces herself as Martha and confesses that she's been stuck in an affair with her boss. Selena, in turn, confesses that she suspects her husband is sleeping with the nanny. When the train arrives at Selena's station, the two women part ways, presumably never to meet again.