Photo: AFP / FILE When author David Mitchell's son was diagnosed with autism at three years old, the British author and his wife Keiko Yoshida felt lost, unsure of what was happening inside their son’s head. In an effort to find answers, Yoshida ordered a book from Japan written by non-verbal autistic teenager Naoki Higashida. Entitled The Reason I Jump, the book was a revelation for the couple who gained a deeper understanding into their son’s behaviours. The pair went on to translate the book into English, and it has since inspired a documentary film of the same name, following the daily experience of five people with non-verbal autisms.