When Thorkil Sonne and his wife, Annette, learned that their 3-year-old son, Lars, had autism, they did what any parent who has faith in reason and research would do: They started reading. At first they were relieved that so much was written on the topic. “Then came sadness,” Annette says. Lars would have difficulty navigating the social world, they learned, and might never be completely independent. The bleak accounts of autistic adults who had to rely on their parents made them fear the future.