In 2004, a man and his 12-year-old daughter were discovered living in a vast park in Portland, Oregon. They’d apparently been living there for four years, in a makeshift shelter with a garden, the man teaching his daughter from old encyclopedias. The two were relocated to a house on a horse farm, disappeared five days later, and were never seen again. The writer Peter Rock took this story and imagined what might have happened to the two, and the book he wrote has been turned into the new movie