Lana Stone has never considered herself a stalker --- until the night she impulsively follows a familiar face through the streets of New York's Upper West Side. Her target? The "anonymous" egg donor she'd selected through an agency, the one who's making motherhood possible for her. Hungry to learn more about her, Lana plans only to watch her from a distance. But when circumstances bring them face-to-face, an unexpected friendship is born. Then, just as suddenly as Katya entered Lana's life, she disappears --- and Lana might have been the last person to see her before she went missing. As she digs into Katya's past, Lana is unprepared for the secrets she unearths, and their power to change everything she thought she knew about those she loves best.