My Cousin Danny and his Mysterious Box is the story of a Jewish boy who survived the Holocaust thanks to the Christian family who hid him on their farm during the World War II.  After the war, while searching for his parents, Danny encounters many rebuffs because he has no identification papers or a tattoo on his arm.  Finally, Danny proves his identity by reciting the first of the four questions asked by the youngest child at the Passover Seder.