"First published in hardback by HarperCollins Children's Books 2008. This edition published in paperback by HarperCollins Children's Books 2012" --T.p. verso.
Summary:
"No human has ever made the Crossing of Ingo - the most dangerous journey young Mer have to face. Sappphy and Conor have been chosen for this epic challenge, and the future of both Air and Ingo depends on their success. But Ervys, his followers and new recruits, the sharks, are deteremined to stop them - dead or alive ..." Back cover.
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