LABYRINTH took us to the walled city of Carcassonne, SEPULCHRE travelled to the mysterious town of Rennes les Bains, now CITADEL transports us right to the southern-most edge of France - and to an amazing adventure set at key points in history in this scarred land right on the Spanish border. Combining the rugged action of LABYRINTH with the haunting mystery of SEPULCHRE, CITADEL is a story of daring and courage, of lives risked for beliefs, of unlocking secrets buried by time. Through history, this 'green land washed red by blood' has seen so much - not least the bravery of the men and women who smuggled exiles out of occupied France and away from the Nazi regime over the border into Spain. In CITADEL, Kate Mosse once again sets out to captivate the reader with the people at the heart of ancient struggles, to bring alive places and times unknown to us and to keep us on the edge of our seats with an amazing story.