The story of Napoleon 1st's long-awaited son, born in 1911. He spent his childhood in the Tuileries, before being separated from his father and taken in and raised by his grandfather, Emperor Francis, who made him an Austrian prince.
In Castallet, a village in Provence, cats are swarming and disturbing the peace and quiet of the inhabitants. The municipality decides to get rid of these invasive felines, but a group of children nicknamed "la bande à Bobo" (Bobo's gang) comes to their defense.
The fiancée of a gangster who has been shot by the police takes an entire police station hostage, armed with a revolver and a bottle of nitroglycerine...