The famous jazzman Carlos Rivera was shot dead during a concert. And it so happened that Inspector Roderick Alleyn was among the spectators during the commission of the crime! But who is the killer? Lord Pastern-and-Baggott, who did everything to promote Carlos's jazz band, and in return received only black ingratitude? The lord's stern wife, Lady Cecile, who discovered that Rivera was having an affair with her daughter, the beautiful Felicite? Or someone else from the many enemies and envious people of the famous musician? Inspector Roderick Alleyn - an aristocrat, an intellectual and the best detective of Scotland Yard - at first sight became interested in the artist Agatha Troy. Unfortunately, his meeting with this witty woman took place under rather unpleasant circumstances... During Agatha's master class in her country house, the model was killed, and the main suspect, the painter and sculptor Garcia, disappeared without a trace. However, isn't this version too obvious? The further Inspector Alleyn investigates, the clearer it becomes to him - each of the guests could be the real killer...