Spring, 1941. Britain is losing the war. Paris is occupied by the Nazis, dark and silent at night.

But when the clouds part, and moonlight floods the city, a Resistance leader called Mathieu steps out to begin his work. The fighters of the French Resistance are determined not to give up. These courageous men and women - young and old, aristocrats and nightclub owners, teachers and students - help downed British airmen reach the border with Spain.

In farmhouses and rural churches, in secret hotels, and on the streets, they risk everything to open Europe's sealed doors and lead Allied fighters to freedom. But as the military police heightens surveillance, Mathieu and his team face a new threat, dispatched from the Reich to destroy them all.