Robert Rinder helps the second and third generations of three families affected by the Holocaust to retrace their relatives’ footsteps and discover the full truth about what happened to them. Robert also explores further his own family’s Holocaust stories. In the first episode, Robert meets Bernie Graham, who remembers that, when he was a child, his grandfather pointed to his missing eye and said 'Nazis', but Bernie doesn’t know what happened to him.

Robert Rinder continues his journey, meeting Noemie Lopian, whose French mother was arrested as a child by the Nazis.