I suspect one of the reasons Dorothy Sayers' books have not quite stood the test of time in the same way Agatha Christie's have is because the subject matter is sometimes totally archaic and obscure. The Nine Tailors in the title of this book is the name of a church bell, not a reference to clothes makers.
Lord Peter Wimsey has a car accident outside a village, arriving just in time to assist with a 9 hour church bell ringing marathon. He just happens to be an expert in ringing the specific bell whose normal ringer has been laid up with the flu. It's not long before an unknown body is found buried in one of the church graves (belonging to someone else). Identifying this unknown body and trying to work out how he died and who buried him is the challenge this time for Lord Peter.
There is a clever twist at the end but I spent most of the book bewildered by all the references to bell names and rings. Historically interesting and a clever puzzle but too obscure a setting for most 21st century readers.