A gripping adventure from the NEW YORK TIMES bestselling author of MAP OF BONES and THE DOOMSDAY KEY. Beneath the ice at the bottom of the Earth is a magnificent subterranean labyrinth, a place of breathtaking wonders - and terrors beyond imagining. A team of specialists led by archaeologist Ashley Carter has been hand-picked to explore this secret place and to uncover the riches it holds. But they are not the first to venture here - and those they follow did not return. There are mysteries here