Captain Hawklin and the Subterranean Empire

Captain Steven Hawklin, a celebrated flying ace of World War I, faces a dire threat in December 1932 when a commando squad attacks him, implicating his estranged father, Thomas. With tensions mounting, Steven must plunge into the depths of the Earth to rescue Hilana, the queen of a subterranean empire, while also preventing a catastrophic invasion by surface armies and stopping a madman's destructive plan. Inspired by the thrilling serials of the early 20th century, "Captain Hawklin and the Subterranean Empire" unfolds a gripping Golden Age adventure filled with formidable foes and mysterious creatures lurking below.