At the heart of French gastronomy lies the famed black truffle of the Perigord.
But France's truffles are being adulterated with cheaper ones from China, and it seems that Chinese organised crime is behind the fraud.
The third internationally bestselling case for Bruno, Chief of Police. In St Denis market, a Vietnamese family has been selling their dishes for years, until their stall is wrecked by attackers who look Chinese.
Again it appears that organised crime is behind the outrage, firing the opening shots of a Viet-Chinese triad war.
When vicious murder, illegal immigration and the importation of underage girls for prostitution are added to the mix, Bruno has his work cut out to keep St Denis from tearing itself apart.