In this 10th book of the new Tom Swift Invention Series, young inventor Tom Swift finds himself with a mystery. Someone is insisting on a face-to-face meeting but refuses to tell Tom why or who he is. All sorts of bells and danger whistles go off in his mind. When the truth becomes known, it sets Tom on a path that will see him building a flying vehicle capable of locating buried bodies, being pressed into a rescue mission when a volcano erupts and threatens to destroy a major city, which then catapults him right into the toughest assignment he's ever faced. Flying through space or swimming deeper in the ocean than anyone ever has been child's play compared to what he faces. The very earth under our feet has a mysterious tear that could destroy several New England states. Nobody knows how long it has been there, but it isn't standing still! It might even travel across the country eventually causing a super volcanic eruption under Yosemite. Tom has never faced the very planet he lives on as an opponent in a battle like this.