It stands alone between Melvyn Douglas's The Lone Wolf Returns in 1935, and the first of Warren William's series of nine, The Lone Wolf Spy Hunt, released the following year.
Lone Wolf | spy | Lone Wolf (gamebooks) | William Holman Hunt | Wolf Vostell | Leigh Hunt | Wolf | The Spy Who Loved Me | John Hunt Morgan | Digital Spy | The Spy Who Loved Me (film) | wolf | Wolf Trap National Park for the Performing Arts | The Hunt for Red October | Lone Star | Hunt Valley, Maryland | White Wolf Publishing | Richard Morris Hunt | Lone Ranger | Hunt | Helen Hunt | Wolf Hall | Tinker Tailor Soldier Spy | Nelson Bunker Hunt | Lamar Hunt U.S. Open Cup | E. Howard Hunt | Christa Wolf | Wolf Biermann | Wild Hunt | Spy Kids |