Red Gold (Night Soldiers #5) by Alan Furst; 1999. Softcover.

Autumn 1941: In a shabby hotel off the place Clichy, the course of the war is about to change. German tanks are rolling toward Moscow. Stalin has issued a decree: All partisan operatives are to strike behind enemy lines—from Kiev to Brittany. Set in the back streets of Paris and deep in occupied France, Red Gold moves with quiet menace as predators from the dark edge of war—arms dealers, lawyers, spies, and assassins—emerge from the shadows of the Parisian underworld. In their midst is Jean Casson, once a well-to-do film producer, now a target of the Gestapo living on a few francs a day. As the occupation tightens, Casson is drawn into an ill-fated mission: running guns to combat units of the French Communist Party. Reprisals are brutal. At last the real resistance has begun. Red Gold masterfully re-creates the shadow world of French resistance in the darkest days of World War II.