Double Traitor By: Edward Phillips Oppenheim

Great Secret By: Edward Phillips Oppenheim

Havoc By: Edward Phillips Oppenheim

House of Whispers By: William Le Queux

Inside the Lines By: Earl Derr Biggers

Marie Antoinette Romances, Vol 1: Balsamo, The Magician By: Alexandre Dumas

Marie Antoinette Romances, Vol 2: The Mesmerist's Victim By: Alexandre Dumas

Marie Antoinette Romances, Vol 5: The Countess of Charny By: Alexandre Dumas

Men of Zanzibar By: Richard Harding Davis

Moon Destroyers By: Monroe K. Ruch

Okewood of the Secret Service By: Valentine Williams

On Secret Service By: William Nelson Taft

Passenger from Calais By: Arthur Griffiths

Power-House By: John Buchan

Quintus Oakes: A Detective Story By: Charles Ross Jackson

Return of Clubfoot By: Valentine Williams

Savrola By: Winston S. Churchill

Short Mystery and Suspense Collection 010 By: Various

Status Quo By: Dallas McCord Reynolds

Strangers And Pilgrims By: Mary Elizabeth Braddon

Supermind By: Laurence M. Janifer

Ten Years Later By: Alexandre Dumas

That Sweet Little Old Lady By: Randall Garrett

The Arbiter A Novel By: Florence Eveleen Eleanore Olliffe Bell

The Best Man By: Grace Livingston Hill

The Dare Boys of 1776 By: Stephen Angus Cox

The Foreign Hand Tie By: Randall Garrett

The Lost Ambassador Or, The Search For The Missing Delora By: Edward Phillips Oppenheim

The Lost Despatch By: Natalie Sumner Lincoln

The New Forest Spy By: George Manville Fenn

The Powers and Maxine By: Alice Muriel Williamson

The Traitors By: Edward Phillips Oppenheim