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 first great Allied intelligence network of the Second World War.

But as Roland Philipps shows in this extraordinary account of her life, when the Germans close in, Mathilde makes a desperate and dangerous compromise. Nobody - not her German handler, nor the Resistance and the British - can be certain where her allegiances now lie...