A classic detective novel of the sort that we do not get now. So, as one of the other reviewers rightly points out, the denoument seems a little unexpected unless, like the audience of the time it was written, the reader has been carefully tracking the clues. Don't be put off! It's a great story.
Wonderful writing with a lot of humour and great characters. Fen is a great favourite of mine with his entertainingly grumpy approach. It is also a period piece. It reminds us oldies of what life was like just after the war and might inspire/amuse the younger of us.