Stranded on the planet Venus, known as Amtor to its inhabitants, Earthman Carson Napier has faced countless perils to win the hand of the courageous Duare, his beloved princess, and to be bestowed with high honors and the title of prince in the powerful nation of Korva. But when a new threat strikes from out of the skies, Carson discovers his own arrival on the planet years ago may have unknowingly led the mysterious enemy to attack.

With the African continent engulfed by World War II, John Clayton, Lord Greystoke, abandons his role as Lord of the Jungle in order to combat the spreading Nazi menace. Flying a P-40 Tomahawk warplane, Clayton is sent on his first mission: to rescue the missing British Military Intelligence officer code-named Ilex. But the daring task plunges him into his savage past after he’s forced down in a lost land that seems hauntingly familiar. 

Chris West’s deadly prowess with his weapon of choice had earned him the name Red Axe in the Stone Age world of Pellucidar at the Earth’s core. Sentenced to die along with the woman he loved by the merciless Mahars, West had fought his way free of the lethal laboratories and ghastly arenas of their underground city. Now he must carve a path for his small band of fugitives through a primordial landscape teeming with monstrous beasts and brutish men bent on their destruction.

 In 1940, as the world hurtled into the darkness of global conflict, Edgar Rice Burroughs turned his legendary writing talents toward an interstellar tale of wonder and adventure set on a war-racked planet - one whose star was so distant that it was invisible to the Earth's most powerful telescopes.

Tarzan's beloved mate, Jane, has been kidnapped, and the furious ape-man will let nothing stand in the way of rescuing her - not even a sinister safari whose target is Tarzan himself. With fierce Masai trackers leading the chase, a trio of white hunters are hellbent on capturing the Jungle Lord. But as the pursuers, and their uncanny half-human tracker, close in from behind, Tarzan races toward even greater danger ahead. For the trail leads to a bizarre, long-forgotten land boasting a multitude of strange and terrifying mysteries: the City Built by God, the Hideous Hunter, and more.

In this, the second book of Burroughs' Amtor series, Napier travels over perilous mountains and through forests, inhabited by creatures more terrifying than any nightmare, in search of the lovely princess Duare, who has been snatched from his arms. In the Room of the Seven Doors, Napier faces the choice of his life. Six doors led to terrible deaths—the seventh is the door to life. But for him, this door too leads only to new dangers on a planet whose beasts and men are more frightful than any that stalk his native Earth.

In the wild, unexplored coastal jungles of West Africa lives a wild human boy named Tarzan, the adopted son of a tribe of fierce almost-human anthropoid apes - but in reality, the unknown heir of a wealthy and titled English noble family. Then one day, a small party of American treasure-seekers is marooned on Tarzan's beach, including a lovely Baltimore belle named Jane Porter.

When Carson Napier's giant rocket crash-lands on the planet Venus, he knows that there will be no return to Earth for him. His only option: find a way to survive until other Earth rockets can reach him—if they can! Beneath the eternal clouds, contrary to everything science predicted, Carson finds a race of strange people inhabiting trees that make the giant redwoods of California look like mere saplings.

The only female student in Cambridge University’s medical program, Jane Porter is far more comfortable in a lab coat dissecting corpses than she is in a corset and gown sipping afternoon tea. A budding paleoanthropologist, Jane dreams of traveling the globe in search of fossils that will prove the evolutionary theories of her scientific hero, Charles Darwin. When dashing American explorer Ral Conrath invites Jane and her father to join an expedition deep into West Africa, she can hardly believe her luck.

Military journalist Raymin Dahl thinks he’s finally getting the story of a lifetime. Secret peace talks on a remote tropical moon are about to surrender five colonized worlds - and 600 million civilians - to a ruthless enemy.