The Book of Henry (2017)

Naomi Watts stars as Susan, a single mother of two, working as a waitress in a small town. Her son, Henry, is an 11-year-old genius who not only manages the family finances but acts as emotional support for his mother and younger brother. When Henry discovers that the girl next door has a terrible secret, he implores Susan to take matters into her own hands in this imaginative and emotional drama.