Captain Grant's Children is a science fiction novel. What is the main story?

The story happened in1July 26th, 864. Sir grina Wan and his party set sail on the cruise ship Duncan. They found a broken document in the belly of a shark eroded by seawater. After analysis, this is a distress document issued by Captain Grant after the crash of 1862 Great Britain, looking for new immigrants for the British. Because the British government refused to send a crew to search, Jazz decided to take everyone with him. Jacques, secretary of the Geographical Society of Paris, became a new member of the ship because he accidentally took the wrong boat.

Duncan passed the Atlantic Ocean, Madaga Islands and Canary Islands, and found no trace of Great Britain. Jacques reminded everyone that this document may come from a river in the American continent. Thus, Jazz, Major, Jacques and others began to explore across the American continent. In this expedition, they experienced volcanic eruption, earthquake, thirst, rainstorm, flood, lightning and fire, being attacked by wolves and surrounded by crocodiles. Jacques thinks Britain should be in Australia. According to this train of thought, Duncan set out from the Atlantic Ocean and arrived at Cape Dabainu. In a manor here, they met the boatswain Elton, who claimed that Captain Grant should be in Australia.

Later, Sir and others discovered that Elton was actually a bandit leader. He lied that Captain Grant was not in Australia, and Elton was going to rob the Duncan and become a pirate. Geographer Jacques wrote a letter to Duncan's first mate, describing Australia as New Zealand and Altun as a prisoner. After getting rid of the threat of bandits, Jazz decided to go to Melbourne by cargo ship, then returned to Europe, made a raft and drifted to New Zealand Island. After Jazz escaped, he reunited with Duncan.

Because Captain Grant was not found, everyone returned to Europe in disappointment. On the way, Elton was exiled to an uninhabited island. As a result, Captain Grant was accidentally discovered on the island. Finally, everyone returned to Scotland smoothly. When Captain Grant returned to his motherland, all Scots celebrated him. His son Rob later became a sailor like him. With the support of Sir, he worked hard and realized the plan of establishing a Scottish colony in the Pacific Ocean.