Espionage

The Secret Dispatch; or, The Adventures of Captain Balgonie

Over the border

The white cipher

The Escape Agents

The Black Venus Contract

The Skeleton Coast Contract

The Canadian Bomber Contract

The Shankill Road Contract

The Mandarin's Fan

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

The Gun-Runner

The presidential snapshot : or, The all-seeing eye

In the tiger's lair

The Gregory circle

The Boomerang Circuit

A Killing for Christ

The Reckoning

Spies of the Kaiser: Plotting the Downfall of England

Graveyard of Spies

The Citadel