For much of their life, Allen and Peter Adamson didn't know that Joe, their easy-going, suburbanite dad, a VP at a New York plastics company, had a remarkable early history. He had escaped Germany at the age of 14 on the Kindertransport, served as an interrogator with the U.S. Army during the liberation of Mauthausen Concentration Camp, and helped in a U.S. effort to intercept secret messages encoded in German postage stamps.