Meet Peter Feigl.

Peter Feigl dedicated his diary to his parents after they left him in the care of Quakers to help hide his Jewish identity. “I wanted them to know everything I did while we were separated.” But then he lost the diary, which contained his only photos of his mother and father, who were murdered at Auschwitz. Decades later, a stranger bought the diary at a flea market and reunited Peter with his childhood memories.

Source: United States Holocaust Memorial Museum