In this engrossing book, a father and son ascend a mountain together, retracing the steps of a boy who went missing there a century earlier--a quest that spawns a tender meditation on nature, family, and the joy of discovery. Six-year-old Hans Torske disappeared in Norway's Skrim mountains in 1894. Why he wandered away from his family's cabin is still a mystery, but his body was found the following summer, lying atop a 2,860-foot...