The Rescue of Jules Verne. Hollow Earth Stories, #1

A world within our world. A secret tunnel hidden under the Eiffel Tower. A small central sun at the center of our planet warming those lands in the hollow earth. Seas with no horizon because of the concave nature of those lands. Adventures beyond the imagination of the modern man at the dawning of the twentieth century. In 1889, seasoned explorer Marco Walker descends into the hollow earth on a desperate mission to rescue Jules Verne on the behest of the Hollow Earth Society.
He finds himself in an untamed land with dangers at every turn and must use his skill, his wits, and every last bit of his experience to rescue Verne and survive this hostile and spectacular land. From Robert J. McCarter, author of Woody and June versus the Apocalypse, comes an imaginative story of adventure and companionship unlike anything before it.