#1 New York Times bestselling authors Douglas Preston and Lincoln Child return with the fourth book in their series featuring the unforgettable character Gideon Crew. Gideon Crew teams up with Eli Glinn and his mysterious company, EES, which is launching an expedition to the South Atlantic to explore the wreck of the huge vessel Rolvaag, lying at the frigid, hostile "Ice Limit" off the Antarctic coastline. The expedition's secret purpose: to find out what really happened to the ship--and the bizarre meteorite contained in its hold that contributed to the vessel's destruction. But as they explore the site of the wreck, they realize the Rolvaag's fate was far stranger than anyone imagined; and that what was contained in its hold was no "meteorite," but an enigmatic, object of unknown origin that not only threatens their lives--but the very survival of Earth itself.