She is one of the most important women of the Second World War — a fighter, a secret agent, a government envoy and a commando. But have we heard of her? Can we sing her name? If not, you've come to the right place.

Tune in to hear the astounding story of Elżbieta Zawacka, AKA Agent Zo. It's a tale which takes us from Warsaw and Berlin to Paris and London, a tale of hope and fear, of courage and terror. Above all else, it is the tale of a young woman who won't take no for an answer when the call comes.

Oswin and Carla are joined today by the historian Clare Mulley, whose excellent new book tells the legend that is Zo. It is a wonderful story and a wonderful life. We're honoured to be able to help tell it.