Address Unknown is a novel written by Kathrine Kressmann Taylor in 1938. The story is told through a series of letters exchanged between two friends, Max Eisenstein and Martin Schulse, who are both art dealers in San Francisco.
Max is Jewish and decides to return to Germany with his family, while Martin, who is German, stays in America. As the letters progress, it becomes clear that Martin has become involved with the Nazi party and has turned against Max and his family.
As tensions rise, Max's letters to Martin become more desperate, pleading for help and understanding. However, Martin's responses become colder and more hostile, culminating in a shocking betrayal that changes both men's lives forever.
Address Unknown is a powerful and haunting exploration of friendship, betrayal, and the devastating consequences of hatred and prejudice.