A World War I tale of espionage in a fictional backwater area in England with no apparent military value called Dreymarsh. The story begins with Dreymarsh residents discovering an observation car from a German zeppelin along with a Homburg hat near Dreymarsh.
This discovery triggers a range of events and introduces a myriad of characters which all make for a rather delightful mystery. He is considered one of the originators of the thriller genre, his novels also range from spy thrillers to romance, but all have an undertone of intrigue.