The world-famous expert analyst Drongo does not like to appear in public with his wife. But this time he compromises this principle. Russian businessman Chistovsky so insistently invites the detective to his birthday that it is impossible to refuse. In addition, a curious company gathers at the businessman’s luxurious villa located in Sardinia... But the wild fun ends suddenly and tragically. Famous playboy Stephen Hart dies in his own room, and later Georgian businessman Avtandil Narsia dies of poison in the living room. Everyone present has an ironclad alibi. Only Drongo himself doesn’t have it..