The unnamed reviewer in The Observer (7 September 1924) wrote: Miss Christie has done one bold and one regrettable thing in this book. She has dispensed with Hercule Poirot, her own particular Sherlock Holmes, to whose presence and bonhomie and infallibility the success of her previous books has been mainly due. After comparing Poirot with Harry Rayburn, the reviewer continued by saying that the book, will be something of a disappointment to those who remember The Mysterious Affair at Styles. It is an excellent and ingenious complexity, in its way, but it might have been written by quite a number of the busy climbers of who now throng this particular slope of Parnassus. One almost suspects that Miss Christie contemplates exchanging the mantle of Conan Doyle for that of Miss Dell; a hazardous manoeuvre, for the two authoresses are very different in tastes and sympathies. The reviewer went on to say that, The plan of the book is rather confused. There is a prologue which does not link itself up with the rest of the story for quite a long time; and the idea of giving alternate passages from the diaries of the heroine and of Sir Eustace Pedler is not altogether justified by the glimpses it gives of that entertaining but disreputable character. One of the points on which some readers will have doubts is as to the plausibility of the villain: assuredly he is a novel type in that role. The book, like all Miss Christie's work, is written with spirit and humour.