The book tells the story of the quest for Captain Grant of the Britannia. After finding a bottle cast into the ocean by the captain himself after the Britannia is shipwrecked, Lord and Lady Glenarvan of Scotland contact Mary and Robert, the young daughter and son of Captain Grant, through an announcement in a newspaper. Moved by the children's condition, Lord and Lady Glenarvan decide to launch a rescue expedition. The main difficulty is that the coordinates of the wreckage are mostly erased, and only the latitude (37 degrees) is known; thus, the expedition would have to circum-navigate the 37th parallel. Remaining clues consist of a few words in three languages. They are re-interpreted several times throughout the novel to make various destinations seem likely. (Summary from Wikipedia)
rs, the sailors threw a strong rope over the starboard side of the yacht, with a big hook at the end of it, concealed in a thick lump of bacon. The bait took at once, though the shark was full fifty yards distant. He began to make rapidly for the yacht, beating the waves violently with his fins, and keeping his tail in a perfectly straight line. As he got nearer, his great projecting eyes could be seen inflamed with greed, and his gaping jaws with their quadruple row of teeth. His head was large, and shaped like a double hammer at the end of a handle. John Mangles was right. This was evidently a balance-fish-- the most voracious of all the SQUALIDAE species.
The passengers and sailors on the yacht were watching all the animal's movements with the liveliest interest. He soon came within reach of the bait, turned over on his back to make a good dart at it, and in a second bacon and contents had disappeared. He had hooked himself now, as the tremendous jerk he gave the cable proved, and the sailors began