The world's sea levels are rising at an alarming rate, too quickly to be caused by glacier melt. A risk so big it sends Kurt, Zoe and the NUMA team around the world in search for answers. It takes them from the shark-filled waters of Asia, to the high-tech streets of Tokyo, to a forbidden secret island, but it's in the East China Sea that a mysterious underwater mining operation is discovered. A global threat. A desperate mission.A devastating endgame.