Gladys deserves the mother of all castles after the ordeal she went through in New York City. But production didn’t need to go to England to find the perfect home for the new Duchess of Buckingham.

The 42-year-old grant writer and novelist has more than 150 puzzles in her collection at home in Portland, Maine, approximately 50 of which are hand-cut hardwood. She has one in progress at all times, ...