“Angel’s Tears”, “Africa Star”, “Hart of Ocean”, which were three expensive diamonds, inlayed on an imperial crown owned by a royal lady of Czar. The crown was lost during an accident in an ocean. It was found by an explorer. The three diamonds were stolen and only the “Hart of Ocean” was owned by the wife of a France ambassador. During a jewelry exhibition, the diamond was lost again. Police officer Lung was responsible for the investigation. Finally, the thief was arrested…