Marion Trippe moved to this village in the northeast of the Netherlands several years ago with her husband, looking for an affordable house in which to spend their retirement days. What they soon discovered was that their house, a converted post office, came with more than space for them and their dogs. It came with a secret. Tucked beneath a staircase was a dirt-floor hiding space. It had been used in the Second World War to hide people from Nazi forces. In the decades since the war, the small community of Nieuwlande has gained recognition for its protection of hundreds...