Something is devouring Earth. . . A suburban house in Oklahoma vanishes into a roaring abyss. A supertanker at sea suffers a fiery destruction. A blast in China drills a gigantic cavern into a mountainside. A severed arm plummets from the sky in Missouri. Could these catastrophes possibly be related? Intrepid geologist Dacey Livingstone is nearly killed by her first attempt to plumb the mystery-a perilous descent into a house-swallowing...