Roald Dahl, the British author of children's books, wrote in a tiny cottage at the end of a trellised pathway canopied with twisting linden trees. He called it the "writing hut," and, since Dahl was nearly six feet six, he must have inhabited it like a giant in an elf's house. Dahl died in 1990, at the age of seventy-four, but one day a year his widow, Felicity, invites children to the estate where he lived, in Great Missenden, Buckinghamshire,… more