It's 1928. Freddie Watson is still grieving for his brother, lost in the Great War. Driving through the foothills of the French Pyrenees, his car spins off the road in a snowstorm. Freddie takes refuge is an isolated village and there meets a beautiful, captivating woman. They spend the night talking of love and loss and war. But by daybreak, Fabrissa has vanished and Freddie realises he holds the key to an ancient mystery that leads him deep into the mountains, to a cave has concealed an appalling secret for 700 years...