The Winter Ghosts by Kate Mosse

I am the last.  The others have slipped away into darkness…

Englishman Freddie Watson comes to on the floor of his room in the tiny French village of Nulle, high in the Pyrenees. It’s winter 1928 and he’s convinced that he spent the night in the company of the townspeople and the lovely Fabrissa, but Mme Galy swears that he did not attend the celebration.  Freddie, still recovering from the combined effects of six months in a sanitorium and his car going off a lonely mountain road begins to doubt his sanity.  He clings to the promise he made to Fabrissa.  He promised to find her and bring her home.   
His promise will free the winter ghosts.