Espionage

The Betrayal

Clandestine

Nothing Will Come Between Us

The Stolen Cruiser

Mystery of the Caribbean Pearls

Four Years a Scout and Spy “General Bunker”

Agent Nine and the Jewel Mystery

Dave Dawson with the Commandos

Watching on the Rhine

The long patrol

Luck on the Wing: Thirteen Stories of a Sky Spy

Under the periscope

The Silent Alarm

Fortunes of War

The Blue Envelope

Thank You, Mr. Moto

Hawk Eye

The Sea-girt Fortress

Hawaiian Sea Hunt Mystery: A Biff Brewster Mystery Adventure

Spies and Secret Service