On a remote jungle island, genetic engineers have created a dinosaur game park. ...But as always there is a dark side to the fantasy and after a catastrophe destroys the park's defence systems, the scientists and tourists are left fighting for survival... -- Cover.

In this recently discovered Crichton novel, the year is 1876. Among the warring Indian tribes and lawless gold-rush towns of America's western territories, two paleontologists pillage the Wild West. They're hunting for dinosaur fossils, while surveilling, deceiving, and sabotaging each other in a rivalry that will come to be known as the Bone Wars. Into this treacherous territory plunges the arrogant and entitled Yale student William Johnson. Determined...

"Where did the tree house come from? Before Jack and Annie can find out, the mysterious tree house whisks them to the prehistoric past. Now they have to figure out how to get home. Can they do it before dark ... or will they become a dinosaur's dinner?" --

On an island off Costa Rica there exists a hush-hush colony of giant animals which attracts the attention of two expeditions. The first one, including children, is led by a paleontologist, the other is made up of evil scientists who want to do experiments. The animals rout both without much concern for their motives.--

London, 1907. Journalist Edward Malone, rejected by the woman he loves because he is too prosaic, decides to go in search of adventure and fame to prove himself worthy of her. Soon after, he meets Professor George Challenger, a controversial scientist who claims to have discovered a "lost world" populated by pterodactyls and other prehistoric monsters.