Le réseau papillon T9

May 1944 – Whilst Doc is in London preparing for the D-Day landings, Gaston and his gang step up their acts of sabotage around Saint-Céneri-le-Gérei.

Meanwhile, Karl, a man from Alsace who has been forcibly conscripted into the German army, decides to desert and grows closer to Anne. At the same time, three British airmen are rescued by André. The presence of all these new clandestine arrivals complicates matters in the village, especially as the new mayor – a collaborator – steps up his surveillance…

Gaston, Elise, François and Arnaud will have to redouble their efforts to ensure that living together goes hand in hand with discretion.