Tintin investigates the theft. He discovers clues that suggest someone entered the room and took the jewel. The house is turned upside down, and Inspector Jolyon Wagg (from the local police) arrives to investigate, often accusing the wrong people.
They are at their most absurd. They arrive to investigate the "theft" but spend their time: getting locked in a cellar, falling into a pond, losing their hats, and trying to use a lie detector on a parrot. They represent the failure of institutional authority. les bijoux de la castafiore
Every classic detective story rule is broken: Tintin investigates the theft