One of a series of crime thriller books by the author, featuring Inspector Elk of Scotland Yard. In this one police hunt for a gang called the India Rubber Men, who wear gas maks and rubber gloves and carry gas bombs. It was later made into a movie.
Attractive black and red 1930's book. Has some age wear. In the back inside cover, is a paperboard styled pocket, but it has no library markings. Please see photos.
Buyer to pay $5 shipping. I will package carefully in a box and ship promptly.