 a couple of people who are involved in the story whether those be historians experts on the subject or occasionally and of course you know sadly of course very few people from that era are still with us but they often did have children perhaps who are reconstructing their stories and i think especially in the case of some of these stories that have been kept secret so stories of spies of course that generation couldn't legally tell their stories so now the next generation is reconstructed you do know it's been done on the world service called witness