Although set in the Golden Age, and often has the look and feel of such this was written in the 1970s by
James Anderson and is the first of a series of novels set in the same country house. Therefore, it is a pastiche but don't let that put you off as it is indeed pretty good.
The story is complicated and has all the tropes you expect from a Golden Age mystery. It is set in a dark country house and includes a cast of toffs, flappers, a bumbling (but ultimately efficient) police detective, perky keen amateurs and plenty of red herrings and puzzles. There is even a map!
The book is well written and an enjoyable read, which just about manages to err on the right side of parody though at times a close run thing. A great send-up and celebration of a genre.