There can be few characters in modern fiction more unpleasant than Paul-Jean Husson, the narrator in Romain Slocombe’s Monsieur le Commandant. Indeed, he is at times too nasty. If this otherwise compulsively readable novel about betrayal in Nazi-occupied France has a flaw, it lies in Husson’s irredeemable villainy, as if to make such a man more rounded, more subtle, were to allow a flicker of understanding for his actions, or to suspect the author of a degree of sympathy for the man.