Espionage

The Secret Dispatch; or, The Adventures of Captain Balgonie

The German Spy in America The Secret Plotting of German Spies in the United States and the Inside Story of the Sinking of the Lusitania

The Young Wireless Operator—With the U. S. Secret Service

Rescuing the Czar

The Spy

Hawk Eye

Spies and Secret Service

The Mandarin's Fan

When Scout Meets Scout or, The Aeroplane Spy

Thank You, Mr. Moto

The Stolen Cruiser

Mystery of the Caribbean Pearls

Agent Nine and the Jewel Mystery

Four Years a Scout and Spy “General Bunker”

Dave Dawson with the Commandos

Luck on the Wing: Thirteen Stories of a Sky Spy

Watching on the Rhine

The long patrol

Under the periscope

The Blue Envelope