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Summary: The "deeply scary"( BBC Focus ) new novel from a national bestselling and critically acclaimed author. Four hostages are rescued from a group of religious extremists in Barcelona. After five years of being held captive together, they make a vow to always watch out for one another. But they never expected this... The world they have returned to has been transformed by water-and the water is rising. As it continues to flow from the earth's mantle, entire countries disappear. High ground becomes a precious commodity. And finally, the dreadful truth is revealed: before fifty years have passed, there will be nowhere left to run...