Never leave things undone.
Sometimes things are not always what they seem, especially in the small suburban town where the Carpenter family lives. Single suburban mother Susan (Naomi Watts) works as a waitress at a diner, alongside feisty friend Sheila (Sarah Silverman). Her younger son Peter (Jacob Tremblay) is a playful 8-year-old. Taking care of everyone and everything is Susans older son Henry (Jaeden Lieberher), age 11. Protector to his adoring younger brother and tireless supporter of his often self-doubting mother and, through investments, of the family Henry blazes through the days like a comet. Susan discovers that the family next door, which includes Henrys kind classmate Christina (Maddie Ziegler), has a dangerous secret and that Henry has devised a surprising plan to help. As his brainstormed rescue plan for Christina takes shape in thrilling ways, Susan finds herself at the center of it.