Rosie Morris is five years old, severely autistic, and has virtually no speech, leaving her entirely dependent on her parents Andy and Kara. Doctors told the couple to expect a "lifelong developmental disability," a diagnosis they refuse to accept, and after a state special school fails to help, they go searching for an alternative. They find it in the Growing Minds programme in Florida, run by behavior analyst Steven Wertz, who argues autism is not a fixed, incurable state and offers a plan tailored to Rosie. A year of fundraising gets the family to the US, and the film follows what happens once they arrive: away from the routines and protections they built at home, Andy and Kara start seeing an ordinary child underneath the diagnosis, willful, spirited, sometimes manipulative. The film's sharpest turn is the parents realizing their own effort to shield Rosie's world may have been slowing her down, and theirs too. An estimated one in 130 people in Europe fall somewhere on the autism spectrum.