During the summer of 1943, the SOE'S largest network in occupied France, collapsed and more than 400 of the French Resistance were arrested. At the centre of this disaster stood the figure of Henri Dericourt , one of SOE's most trusted agents. However, Dericourt had also been working for German Intelligence. Following the publication of a new book (All The King's Men by Robert Marshall ), which examines the events surrounding the collapse of SOE's network, Timewatch have updated this programme, originally transmitted in 1986.