After the Colonel makes René promise not to have further contact with the Resistance, Herr Flick's sausage (containing the forgery of the Fallen Madonna) is stolen by the Communist Resistance. The Colonel and the Captain are anxious that it isn't revealed that they have switched the paintings, and order René to come up with the ransom, which Edith gets from Monsieur Alphonse. The ransom is to be left by René and his staff, dressed as German soldiers. But the whole thing is watched by German soldiers dressed as French policemen, the Gestapo dressed as French Resistance girls, and the Colonel and the Captain dressed as trees. And of course, Lieutenant Gruber stumbles upon the meeting, and his dog can't help but chase the sausage.

The sausage containing the painting of the Fallen Madonna, which was taken by Lieutenant Gruber's dog, is minced by the Lieutenant – but fortunately he discovers it first and saves it. At the same time, the missing knockwurst means that Monsieur Alphonse cannot get back the money which he lent to pay the ransom of the stolen sausage. The Resistance pays him back with Monsieur Leclerc's badly forged money. But after everything seems to be getting back to normal, the sausage is sent to Lieutenant Gruber to make another copy. Also, Michelle's latest plan to get the British airmen back is by an old plane with the engine from General Von Klinkerhoffen's motor mower.

After Maria is sent to Lieutenant Gruber with the sausage containing the real painting of the Fallen Madonna for copying, she is caught by General Von Klinkerhoffen, who places the sausage in his wardrobe and holds Maria hostage until his motor mower engine is returned by the Resistance. Herr Flick, the Colonel, the Captain and René hear about this and decide to go to the chateau through the secret passage and steal the sausage from under the General's nose, using Helga, Yvette and Lieutenant Gruber as a honey trap.

With René again in the possession of the sausage containing the painting of the Fallen Madonna, attention turns to getting the two British airmen out of France. Michelle's newest harebrained scheme of getting the airmen out is a steam engine tour through Nouvion, and will of course require eighty metres of braces, and it's René's job to get them from every Frenchman in Nouvion. Herr Flick and Helga arrive in his staff car to spy on the show.

After the plot to get the two British airmen out failed, a frustrated René returns to the painting of the Fallen Madonna. He hides it behind an ugly painting in his café which is immediately recognised by General Von Klinkerhoffen as a Van Gogh and requisitioned for his office in the chateau. He also requisitions the two new maids in Café René – or as they are better known: the two British airmen in disguise. Realising that the two airmen will be recognised right away, Michelle of the Resistance comes up with another harebrained scheme of digging a tunnel from Monsieur Alphonse's mortuary into the prisoner-of-war camp and smuggling in the two airmen.

While the Captain is sitting in the café, Herr Flick of the Gestapo is listening when René is talking to London on the wireless. He soon cracks the code of the message as the plan to dig a tunnel from the mortuary to hide the British airmen. But it's soon apparent that the two airmen and Monsieur Alphonse need help with the digging, and the café staff are called in, leaving Madame Fanny and Leclerc in the café. But the Colonel and the Captain follow René, discover the tunnel, and are captured in the prisoner-of-war camp.