It had seemed like the perfect California day. But as Joey Flores walked home from the skate park with his friends, the ground began to tremble, and Joey knew they were headed for trouble . . . The earthquake that followed devastated their neighbourhood, collapsing a nearby overpass with Joey and Fiona on one side and Kevin and Dylan on the other. Now Joey and his friends must rescue each other, endure the aftershocks, and find a new way home as the earth cracks beneath their feet.