The Vanderhaven family of Manhattan has it all: wealth, prestige, good looks, and a thriving business empire. But their seemingly perfect world is ripped apart when their younger daughter, eight-year-old Brenna, runs off after overhearing her parents arguing. Out on the streets, she quickly realizes she's lost. Even more frightening, Brenna soon realizes that a man is following her. Meanwhile, in a townhouse in Brooklyn, Callie Griffin is throwing a birthday party for her one-year-old son, Oliver. The joy of the day is ruined by her sister Lauren's too short, drive-by appearance. Once close, the two sisters haven't been able to move past a falling out that took place three years before. When Brenna notices the strange man getting closer, she panics and takes refuge in the Griffin home, befriending their four-year-old daughter, Summer, who is waiting out the party upstairs. As family and friends search for Brenna, her absence helps her father realize the importance of family, even as her presence in the Griffin home unwittingly sets in motion healing for a mother's heart.