Armstrong and the Mexican Mystery

A mysterious gunman meets Marshal Armstrong in San Francisco with tales of lost gold, unrequited revenge, and an unsolved mystery in Mexico's Chihuahuan Desert, inspiring Marshal Armstrong, Ambrose Bierce, and the rest of Armstrong's loose band of soldiers of fortune to plunge into an adventure of fierce gunfights, criminal conspiracies, an innovative submarine, and an underground, secret superpower-the remnants of Atlantis-that aims to subvert Western civilization! Can the malevolent, scheming Atlanteans be stopped? That's the mission for George Armstrong Custer, traveling incognito as Marshal Armstrong Armstrong, knight-errant --