Agatha Christie, Dorothy L. Sayers, G.K. Chesterton and nine other writers from the legendary Detection Club collaborate in this fiendishly clever but forgotten crime novel first published 80 years ago. In 1931, the newly-formed Detection Club collaborated in publishing a unique crime novel. In a literary game of consequences, each author would write one chapter. In addition, each of the authors provided their own solution in a sealed envelope, all of which appeared at the end of the book, with Agatha Christie s ingenious conclusion acknowledged at the time to be enough to make the book worth buying on its own .