Thanks to my writer colleagues – Chris, Dimitri, Marie, Gwyneth and Mary Ellen – and to my pre-readers, Beatrice, Andy, Ruth and Simon, as well as to author reviewers Eve Seymour, Laura Wilkinson, Dionne McCulloch and Dave Poyer, and a very special thanks to my editor at Harper Collins, Charlotte, for helping me raise my game. Thanks also to my former diving buddies at the Birmingham University Diving Club and the Halden Diving Club, and anyone else I’ve had the pleasure of diving with on this blue planet, from Stoney Cove to Sipadan.