An arm with a bee tattoo is found under the Pont des Trous in Tournai. The arm may have drifted for a long time on the Escaut before being found under the bridge. Given this uncertainty about the scene of the crime, Mathilde, an inspector from Tournai, is assisted by Vincent, a French police officer. Their investigation will take them along the banks of the Escaut, into the world of boatmen and on the trail of a mysterious bee, the symbol of Tournai, inherited from Childéric I, King of the Franks, at the time when the city was the capital of the Kingdom of France. (thetvdb.com)