Beauty Vienna, luxurious Marriott Hotel, New Year's Eve... The famous forensic expert Drongo came here to spend his favorite holiday with a narrow family circle. But someone else's misfortune cancels out all his rosy plans. During a festive dinner in the hotel restaurant, a major businessman Galimov is killed. A body with a slit throat is found in the first floor toilet. And no clues. Unless, of course, you count a few phrases heard at the next table, which the detective accidentally caught out of the corner of his ear...