A scientist discovers a way to turn cow manure into energy. Two secret agents are dispatched to find out the formula but they devote more time to having sex with each other than they do going after the scientist. Pretty soon everyone in the area is after the scientist but they also wind up spending more time having sex with each other.
The German innkeeper Susan, now leading an acting troupe, travels to Italy and uses feminine wiles to undo an assassination plot against Napoleon, and rescue a local count (a great romancer) from his own enemies.
The actors Heinz Doll, Hans Stiegler and Werner Mack have failed to look after the end of the last season in time for a new commitment and are now unemployed. Since they are just right that the Salzburg mountain hotel "Zum Blaue Enzian" staff looking for.
