https://www.amazon.com/How-Briggs-Died-Douglas-Harding/dp/1914316428/

A detective novel by Douglas Harding. See if you can solve the puzzle before the detective does. It is an unusual plot. And, something happens in the story that has a bearing on Harding's discovery of his 'headlessness' just a few years after he wrote this novel. Curiouser and curiouser...