Maddie Ziegler and Jaeden Lieberher on new film 'The Book of Henry'

Maddie Ziegler and Jaeden Lieberher star in "The Book of Henry," which tells the story of Henry (Lieberher) -- a precocious 11-year-old who has a crush on the girl next door, Christina (Ziegler). Christina has a secret, and Henry devises a plan to help.