The Secret of Chimneys by Agatha Christie: (Annotated)

Behold, one of Agatha’s greatest crime fiction works. It is an exciting story with a bewildering array of potential murderers and a curious collection of detectives, amateur and professional, and with a crook of international importance and consummate ability.<br/>There is more than murder in this story; there is a treasure hunt in it, not for gold but a diamond, and the story is suitably staged for the main part at Chimneys, that historic mansion whose secret will be found in Chapter XXIX, though the wise in these matters may have discovered it a little earlier.