Espionage

The Red Room

Stalemate

The Power-House

The Minister of Evil

Clubfoot the Avenger

Walker of the Secret Service

The House of Spies

Slayer by Stealth

The Texas Hawks; or, The Strange Decoy

Wildcase

Eye of the Virgin, The

Eye of the Archangel

High Treason

The Blue Noon

The Private Sector

Somewhere East of Life (The Squire Quartet, Book 4)

The Covenant

The Davidian Report

Storm Crow

The Oxford Gambit