Occupied Paris, 1940. A woman in a red hat and a black fur coat hurries down a side-street. She is Mathilde Carre, codenamed 'the Cat', later known as Agent Victoire - charismatic, daring and a spy.

These are the darkest days for France, yet Mathilde is driven by a sense of destiny that she will be her nation's saviour. Soon, she is at the centre of the...