Swing, Brother, Swing by Ngaio Marsh
Swing, Brother, Swing is fairly typical for Marsh. We have a dysfunctional family, headed by Lord Pastern and Baggott, whose newest obsession is playing the timpani for a swing band. Pastern's step-daughter, Fee, is not quite but almost engaged to Carlos, who plays the accordion. Carlos is sleazy and overly jealous, and Fee is not quite sure what to do about the situation. She's even written to an advice columnist about it. Turns out, she doesn't have to worry. He gets killed during the band's act. Happily, Alleyn was watching the show and loses no time starting the investigation.
We also have a young couple, Carlisle and Edward Manx. At the beginning of the book they are friends, but we see the relationship evolving as the night and day unfold. A young couple who should be together and deserve a happy ending often shows up in Marsh's books.
The murder weapon is interesting in this one; it's not one of the...