It's not surprising that Sue Perkins finds plenty of humour in her family tree, even in the poignant stories of an orphaned grandfather and a great-grandfather interned as an enemy alien during the First World War. But when she delves into the German branch of her family, who were living in eastern Europe through the Second World War, she uncovers a harrowing tale of refugees fleeing back and forth across borders between Nazi and Soviet control. It's a reminder for Sue that history is full of real people who "always pay the price for the decisions that the big guys make."

Comedian, presenter and actor Matt Lucas had an exceptionally close bond with his late grandmother, Margot, who came to the UK in 1939 as a Jewish refugee from Nazi Germany. Matt has never fully understood what Margot experienced as a young woman in Berlin in the lead up to the Second World War, or what became of the close-knit extended family she left behind. Matt's poignant journey takes him to Berlin and then to Amsterdam, where he discovers an extraordinary connection to Anne Frank, as well as the fate of his many family members who fled to neutral Holland only to find themselves trapped as the country was invaded by the Nazis.