France, 1935: At the poor man's end of the Riviera sits Le Rayol, a haven for artists, expatriates and refugees. Here Tom Nash has rebuilt his life after a turbulent career in the Secret Intelligence Service. But when a midnight intruder tries to kill him, Tom knows it is just a matter of time before another assassination attempt is made. Gathered at Le Rayol for the summer months are all those he holds most dear. Reluctantly, Tom comes to believe that one of them must have betrayed him ...