When a worldwide earthquake opens up cracks in the Earth, it causes a few people to fall down to the earth's core, finding civilization. Two of those people are Fia, a girl originally from Canada who was in Italy doing an exchange program, and Rey, a girl from London. After landing, they both meet each other, as well as Flint, the prince of the Core. They also both learn about the Earth's power. A powerful source holding the Earth's elements, keeping the planet running. Now Flint must help the girls find their way back home to the Earth's crust.