Caspak

Starting out as a harrowing wartime sea adventure, Burroughs's story ultimately develops into a lost world story reminiscent of such novels as Sir Arthur Conan Doyle's The Lost World (1912) and Jules Verne's The Mysterious Island (1874) and Journey to the Centre of the Earth (1864). Burroughs adds his own twist by postulating a unique biological system for his lost world, in which the slow progress of evolution in the world outside is recapitulated as a matter of individual metamorphosis.

The People That Time Forgot is a direct sequel to The Land That Time Forgot and continues the lost world saga begun in the earlier story. Burroughs continues the revelation of his lost world's unique biological system, only hinted at in the previous instalment, in which the slow progress of evolution in the world outside is recapitulated as a matter of individual metamorphosis. This system forms a thematic element serving to unite the three otherwise rather loosely linked Caspak stories.

In uncharted Caprona, an island lost from the map of the earth, where time had stopped and all the primeval creatures of long-gone ages still prowled, Bowen Tyler was lost. To find Tyler, Thomas Billings traveled across the world to Caprona with every advantage the modern world could afford. A light hydroplane would allow him to scale the perilous wall of cliffs that surrounded the island, and rifles, pistols, and ammunition would provide protection against the monstrous prehistoric beings Tyler had so vividly described. But even stranger mysteries awaited him where that barbaric civilization hid, torn between the impassable jungle on the one side and an unknown menace on the other.

Out of Time's Abyss is a direct sequel to The Land That Time Forgot and The People That Time Forgot, continuing the lost world saga begun in the earlier stories. It connects the previous two instalments, bringing in characters introduced in each. Burroughs completes the revelation of his lost world's unique biological system, only hinted at in the previous instalment, in which the slow progress of evolution in the world outside is recapitulated as a matter of individual metamorphosis. This system forms a thematic element serving to unite the three otherwise rather loosely linked Caspak stories. (from Wikipedia)

Out of Time's Abyss is an Edgar Rice Burroughs science fiction novel, the third of his Caspak trilogy. The sequence was first published in Blue Book Magazine as a three-part serial in the issues for September, October and November 1918, with Out of Time's Abyss forming the third installment. The complete trilogy was later combined for publication in book form under the title of The Land That Time Forgot (properly speaking the title of the first part) by A. C. McClurg in June 1924. Beginning with the Ace Books editions of the 1960s, the three segments have usually been issued as separate short novels. The third of these is treated in this article.

Two WWI enemies must work together to survive on a lost island of dinosaurs and prehistoric tribes in this classic sci-fi fantasy novel. Shipwrecked by a German U-Boat, American soldier Bowen J. Tyler and the beautiful Lys La Rue are the only survivors. They join forces with a British tugboat crew and manage to survive by taking over the German sub. Now, operating an enemy ship, they are unable to find safe harbor. And with a saboteur aboard, they soon go wildly off course. Adrift in Antarctic waters, the half-starved passengers spot what appears to be their salvation: the lost island of Caprona. But once they pass through the island's exterior cliffs, they encounter a host of dangers believed to be long extinct. In a tropical land full of dinosaurs and Neanderthal tribes, double crosses within their own ranks may yet be the worst threat of all. But when Lys goes missing, Bowen will risk his life-and his last chance to escape the island-to find her.