Let's be clear: this book is a NOVEL....The Ingram review isn't much better: yes, there's a beautiful woman and a stolen diamond in the story, but she has nothing to do with the theft.
In some ways, this is classic Christie, complete with nefarious goings-on in the grand country home, swarthy-looking foreigners, a beautiful heroine, a manly hero, the mysterious dead body, etc., etc. What raises it above the rest (and makes it one of my favorite Christie books) is that there is an unusual amount of HUMOR in the book, and more than a dollop of romance. And it's clever, altho' the "who-dun-it" is a bit obvious by the end. However, this is one book worth reading for what happens BETWEEN the crime and the revelation of the crook.
For budding Christie fans, you should know that "Chimneys" features some of the same characters found in "The Seven Dials Mystery," including the young Lady Eileen Brent (aka, "Bundle"), her long-suffering father Lord Caterham, the over-earnest George Lomax, and Bill Eversleigh - who marries Bundle at the end of "Seven Dials" but is infatuated elsewhere in this volume. Crime-solving is by the impassive Inspector Battle, another one of Christie's recurring characters.
A delicious read for a rainy week-end or a day at the beach.