The Case of the Courtlandt Jewels

Dr. Huxton Rymer, an antagonist of detective Sexton Blake, has settled down to a seemingly honest life in rural England. But the temptations of crime are a bit to attractive to him and one proposal is just too tantalizing and inventive to be resisted.
The results of that crime literally drop from the sky to Tinker's amazement-but the resolution takes Blake even to Paris where Rymer introduces the lovely and capable Mary Trent.