The Resistance want René to set up a mobile radio station. The necessary equipment is dropped by a British plane. Unfortunately, it drops down one of the chimneys of the château. René and his staff take the place of a flamenco dance group booked to perform at the château, so that they can retrieve the radio equipment. Lieutenant Gruber has arranged to deliver a photograph of the painting of the 'Fallen Madonna' to a Spanish art expert who is posing as a member of the real flamenco dance group. Gruber gives the photograph to Monsieur Alphonse, thinking that he's the art expert.

Michelle now has the photograph of Lieutenant Gruber holding the painting of the 'Fallen Madonna'. She blackmails the Germans, demanding ten million francs for the return of the photograph. Colonel von Strohm, Lieutenant Gruber and Helga plan to hijack a German pay truck to get the money to recover the photograph. Herr Flick uses a truth drug on Helga and learns about the planned robbery. He and von Smallhausen decide to rob the truck themselves. They arrive just after the robbery has taken place and are arrested as the culprits.

Hitler and Goering are due to visit the area. General von Klinkerhoffen plans to have them assassinated. It turns out that the two German dignitaries are, in fact, impostors sent to the area as decoys. Helga plans to smuggle dynamite into the prison where Herr Flick and von Smallhausen are being held. The dynamite ends up on the lunch table and blows up the two fake German dictators. Colonel von Strohm and Lieutenant Gruber are ordered to continue the impersonation of Hitler and Goering. Meanwhile, Mimi is planning to assassinate the supposed German leaders.

The batteries being used to power the Resistance's mobile radio station need more lead. Monsieur Alphonse, Officer Crabtree, Mimi and Yvette attempt to steal some lead from the church roof. Colonel von Strohm and Lieutenant Gruber are disguised as Hitler and Goering so that they can be seen driving out of the area. They are ambushed and captured by the Communist Resistance.

Michelle organises a meeting with the Communist Resistance to discuss future propaganda. A fight starts over René. Colonel von Strohm and Lieutenant Gruber escape in the confusion and head for the Café René. Herr Flick and von Smallhausen almost meet their maker in front of a firing squad.

Colonel von Strohm stuffs the ten million Francs into a large dogfish and releases it into the river so that the Resistance can retrieve it. Monsieur Alphonse catches the fish instead and sells it to the local fishmonger. Von Smallhausen buys the fish and it's served up to Herr Flick and Helga, who finds the money. Herr Flick offers to return it to Colonel von Strohm in return for the original painting. General von Klinkerhoffen has René and Edith dressed up as Hitler and Goering so that they can be used as bait to trap the Communist Resistance.

British troops rescue René and Edith just as they're about to be executed. Fanny and Monsieur LeClerc, thinking that René and Edith are now dead, take all of the money they can find in the café and head for Paris. General von Klinkerhoffen now has the compromising photograph of the Lieutenant with the painting, so Colonel von Strohm and Lieutenant Gruber decide to head for Spain with the travelling flamenco troupe. Before leaving, they meet Herr Flick to swap the painting for the ransom money. Herr Flick gives them a bundle of newspaper and they give him the 'missing booby'.