The picture is a modern interpretation of the memoirs of the famous Russian detective of the tsarist times, Arkady Koshko. The main character, the piano tuner Andryusha, is both the happiest and most unfortunate person in the world. The happiest - because he is passionately in love with the most beautiful of women - Lina, and she reciprocates. But Andrei - alas - is poor, while Lina, the spoiled daughter of wealthy parents, is used to living in abundance and luxury.