2012 . Helen Dunmore
In the depths of the ocean, a monster is stirring. Only one girl - half Mer, half human - has travelled to the bottom of the sea and returned alive. With the help of her friend the whale, Sapphy must return to the Deep to fight this terrifying creature - and her brother Conor and Mer friend Faro will not let her go alone.
HarperCollins Publishers Limited
0007464126 (ISBN13: 9780007464128)
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