The Spy Hunter

The Spy Hunter

Written by William Le Queux

Subtitled: Setting forth certain statements of Harry Nettlefield, ex Marconi operator, who was engaged in the exciting work of hunting down German spies in Great Britain. [Possibly the longest subtitle I have encountered.]A collection of (likely) 7 adventures first published in the British monthly magazine, The Royal Magazine in 1915. 
The stories contained are:
The Green Blackbird
The Mystery of the Two Circles
The House of Suspicion
The Mystery of the Five Beans
Behind Locked Doors
The Secret of the Lonely Farm
The Red Rooster
The Glass Bombs
The Night of the Seventeenth