A long time ago, an Indian princess, having run away from home with her beloved, took with her a precious necklace - and after a long time, its auction was finally announced. However, the rare piece of jewelry never appears at a foreign auction, changing owners through criminal means. The general's widow who owned it was killed, and her jeweler was killed too, and in a similar way. Investigating this case, Major Milonov and Captain Gorokhova first look for one killer, but in the process they realize that they are dealing with a whole tangle of ingenious crimes...