<P> The film premiered at the Los Angeles Film Festival on June 14, 2017 . It was released in theaters by Focus Features on June 16, 2017, and received generally negative reviews from critics, mostly focused on the film's plot twists and tonal shifts, and Trevorrow's direction, although the cast received some praise . </P> <P> In a small suburban town in the Hudson Valley, 11 - year - old boy genius Henry Carpenter and his younger brother Peter are being raised by their single mother Susan, a waitress who is working on writing children's picture books . Henry has used his intellect to invest successfully in the stock market, building up a very substantial nest egg for his family . Henry also protects Peter from a school bully and builds Rube Goldberg machines in their tree house . Henry and Susan are both fond of their next - door neighbor (and Henry's classmate), Christina Sickleman, who has recently become glum . </P> <P> Henry sees Christina being abused by her stepfather, Glenn, the local police commissioner . Henry reports the abuse to social services and the school principal, Janice Wilder, but Glenn has connections throughout the local government, and Wilder is reluctant to challenge the commissioner without "conclusive evidence". Henry is unable to get the authorities to launch a serious investigation that would protect Christina . Henry tells his mother that when someone is in trouble, those who can help must take action . He develops a detailed plan to rescue Christina that he memorializes in a notebook . After a violent seizure, Henry is taken to the hospital, where he is diagnosed with a brain tumor and undergoes surgery . Anticipating his death, he tells Peter to give Susan the notebook . Days later, Henry dies in Susan's arms in the hospital . </P> <P> Susan is distraught at Henry's death and has difficulty functioning, but when Peter gives her the notebook, she focuses on Henry's plan . Susan tries, but fails, to interest a nearby social services agency in opening an investigation . One night, from the window in Peter's bedroom, she sees Glenn in Christina's room and decides to carry out the plan . The notebook and an accompanying cassette tape describe Henry's step - by - step plan to kill Glenn with a sniper rifle while covering Susan's tracks so that it will be impossible to trace the murder back to her . Susan's alibi is to be provided by executing the murder while both Christina and Peter are performing at a school talent show . </P>

What happened to henry in the book of henry
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