Jonathan and his family are camping on deserted Magpie Island when his mother breaks her ankle. Because Jonathan`s sister, Abby, uses a walker the parents hurry ahead to seek medical help while Jonathan, Abby, and their dog walk back to the camper. Before the trio reaches their destination, an earthquake strikes. Now Jonathan must help his sister, whose walker was crushed in the quake, while wondering if his parents made it off the island and are sending back help, or if they too are trapped.