How did so few men manage to organize resistance networks and gather so
much intelligence in such a short time despite being unceasingly hunted
by the German and Vichy counterespionage services?
It is thought that 70% of the information which was vital for the Allies
before the Normandy landings in 1944 was sent by French agents working
for the BCRA.
Using very often unpublished or ignored documents, the author gives an
account of General de Gaulle's secret services which, in 1940, were
thought to be just a small group of amateurs but which as the war
progressed, became a powerful war machine in the service of the Free
French.