The Book of Henry
Susan Carpenter is a single mother raising two sons: Henry, an eleven-year-old child prodigy who manages their household finances and often acts as the parent, and his younger brother, Peter. Henry becomes increasingly concerned about their next-door neighbor, Glenn Sickleman, the police commissioner, and his treatment of his stepdaughter Christina, who is Henry's classmate. After Henry is diagnosed with an inoperable brain tumor and passes away, Susan discovers a detailed notebook he left behind. The notebook outlines a meticulous plan for Susan to rescue Christina, whom Henry believed was being abused by Glenn. The elaborate scheme culminates in Henry's instruction for Susan to kill Glenn, framing it as an accidental shooting, and provides all the necessary steps and tools. Grappling with her immense grief and the moral implications, Susan must decide whether to follow through with her deceased son's final, desperate plan to save Christina.