The Lost World by Michael Crichton is a great science fiction novel about a group of scientists of different fields that go on an expedition to an island to bring back a rich and stubborn scientist from a test expedition that he cared about more than his life.
The 'lost world' is an island off the coast of Costa Rica called Isla Sorna on which a company named InGen (Short for International Genetics Corps.), genetically engineered and contrived dinosaurs which were extinct since 65 million years. This island was used as an incubator for the dinosaurs before they were shipped to another island close by called Isla Nublar. Isla Nublar was leased by InGen for a biological preserve for tourists to see the dinosaurs at a certain cost. After a tremendous tragedy at Isla Nublar, the company went bankrupt and destroyed Isla Nublar. They did not bother to mess with Isla Sorna because of publicity reasons.
For six years no one knew about this lost world. Many times there were cases of large unknown animals at Costa Rica, but no one found out what they actually were or where they had come from. A rich scientist named Dr. Richard Levine performed research on some of these animals and found some clues which led him to the lost island. He set out on a test expedition with his colleague to find out exactly if he was on the right island. He missed his boat back home to the states. So, he called his friend, Dr. Thorne with his satellite phone and left a message asking him to come down to the island and get on with the expedition. Dr. Thorne, Ian Malcolm, Dr. Sarah Harding , and two kids that sneaked in with them, went to the island to rescue Dr.