One morning in June, with the smell of an approaching thunderstorm in the air, an elderly man, his hair carefully parted to one side and wearing a freshly ironed, collared shirt, rings the doorbell of a farmhouse in the Bohemian Forest, a low mountain range in the Czech Republic. He has a long journey behind him, across two international borders and hundreds of kilometers, the last few hundred meters of which lead down an alley lined with pear trees. The man knows this farmhouse and the dark brown, weathered barn at the end of the gravel road. He has been here before, here in the Czech village of Brnírov. He has returned because he wants to fulfill his promise.