Kim Peek could read two pages of a book at once, one eye per page, and recall nearly everything he had ever read, yet he could not button his own shirt. This film follows the Salt Lake City savant whose life inspired Dustin Hoffman's character in Rain Man, though Peek's condition differs sharply from the autism the film portrayed. Interviews with his father Fran, who cared for him and eventually took him on public appearances, trace how a man once written off by early doctors as unteachable became a phenomenon capable of memorizing entire cities' phone books and reciting historical dates on command. Neurologists examine his brain scans, which show a missing corpus callosum, and discuss what his abilities suggest about how memory actually works. The film also shows the toll of his gift, his difficulty with ordinary physical tasks and social cues, and the effect that public attention had on his later years. It is a portrait of a singular mind rather than a movie tie-in.