Do Mildred and Arvid suspect they are under surveillance? The final letter Mildred writes to her family is dated August 14, 1942. Otto Donner smuggles it from Germany to Switzerland, where he posts it to Chevy Chase, Maryland. The envelope Harriette opens bears a Swiss postmark. The letter is carefully worded: May we all remain as healthy as possible so that we may see each other again with great happiness. Despite our being separated, let’s not be worried and anxious. Two weeks later, Mildred and Arvid flee Germany.