John Rhode 
Fatal Garden 

The Fatal Garden, first published in 1949, is book no. 49 in the series of mysteries featuring private detective Dr. Priestley and Scotland Yard’s Superintendent Waghorn. Author John Rhode, a pen name of Cecil Street (1884-1964), was a prolific writer of mostly detective novels, publishing more than 140 books between 1924 and 1961. From the dustjacket: "Yes, the initial murder in this book was certainly committed on a path in a garden; but it is possible that the ingenious author chose this title to suggest his manner of dealing with his readers. For, though always perfectly fair and with a soul above such things as "red herrings, " he can usually be found to have some little surprises up his sleeve. Such, for instance, in this book is the mystery of the Bedford Row solicitor. . ."