Bill Brock and the team venture into the abandoned Shadow Mine in Calaveras County, California, to hunt the SubterAlien, a creature that might be more sophisticated than any they have hunted, one that might be armed and hostile
Bill Brock and his team of hunters travel to Northern California to a river cave called Cross Creek Cavern, where they believe a monster known as the Draco, a vicious lizard/human hybrid, lives beneath the surface of the dark waters.
Bill Brock and his team of hunters travel to Two Guns, Arizona, to the Apache Death Cave - the site of an infamous Native American massacre - in search of the Aswang, a legendary shape-shifting, vampiric creature, part dog and part human.
Bill Brock and his team travel to Peach Springs, Arizona to a show cave called The Grand Canyon Caverns, to investigate a newly discovered section of the cave, unexplored by man but possibly hiding a murderous creature known as the Rake.
In the maze that is Flagstaff, Arizona’s Volcano Caverns, Bill Brock and his team believe that a giant, deadly reptilian bat creature known as the Olitiau, or "cave demon" has made this cave its home.
Bill Brock and his team suspect recent black bear deaths are due to the Mapinguari: a descendant of the giant prehistoric sloth. Together they travel to Graveyard Gulch, a treacherous cave in Northern California to hunt this deadly monster.
