Captain Steven Hawklin, known worldwide for his daring exploits, is adored by many, revered by others, and considered one of the greatest flying aces of the First World War. Along with his close friends, Hardy Miller and Oscar “Oz” Lyman, the three have traveled the world seeking adventure.

December 1932

When Steven is assaulted and nearly killed by a strange commando squad, all evidence of their attack points to one person: Thomas Hawklin, Steven’s estranged father, who has in his possession what the commandos seek: Hilana, queen of the subterranean empire. With blood spilled and tensions high, Steven must work fast to prevent the armies of the surface world from invading the underworld kingdom, while in turn stopping the underground dwellers from unleashing a weapon so devastating that no one on the planet could survive.

Descending into the belly of the Earth, Steven leads his team into the dark recesses of the planet. His mission: save Hilana, stop the attack on the surface world, and prevent a madman from carrying out his insidious plot.

Inspired by the cliffhanger serials of the early 20th century, Captain Hawklin and the Subterranean Empire is a Golden Age adventure story, filled with heroes and villains, giant spiders and beasts below. It’s an adventure story in the tradition of Buck Rogers, Doc Savage, and Commando Cody.