Used book – Les mots du passé, Jean-Michel Denis

In the summer of 2003, a terrible heatwave dried up France. Louis and his son were about to go out to sea off the coast of Charente to find some relief from the heat. Suddenly, a phone call forced them to turn back. It was Pierre, Louis's father. This usually discreet, even withdrawn man, suddenly felt an urgent need to talk to his son. Pierre and Louis would then go back in time to the dark years of the Occupation in Paris, which would have totally unexpected and profound consequences...