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Stephanie (played by Anna Kendrick) is a cheerful and optimistic single mother who also runs her own live streaming channel. She frequently shares her insights on life online, and her unique recipes are highly favored by her fans. One day, Stephanie accidentally meets Emily (played by Blake Lively), a woman who appears confident, wealthy, and glamorous. Emily lives in a luxurious villa with her husband, Sean (played by Henry Golding), who is a university professor. Naive Stephanie quickly develops a deep friendship with Emily, and they become close friends who share everything. However, one day, Emily disappears with Stephanie's son. When Sean, Emily's husband, cannot provide any useful information about her disappearance, Stephanie decides to take matters into her own hands and search for their whereabouts.