The Kraken is awake. A devastating flood has torn through both Air and Ingo, and yet the danger has only just begun. Mer legend has it that only those of mixed blood can defeat this terrible monster and so it falls to Sapphire, a human child with Mer blood, to journey to the Deep and face it. Stalwart brother Conor and best friend Faro refuse to let Sapphire face the Kraken alone. Together, they find the mother whale and with her as their guide, risk their lives to save the Mer.
My thanks to the nice people at Harper Collins for sending the book.
While ''The Deep'' stands up by itself, it would be better to read [[''Ingo]] '' and [[''The Tide Knot]] '' first. Frances Hardinge's [[Verdigris Deep]] also combines family stresses with magic fantasy, while Katherine Langrish's [[Troll series]] asks children to show courage in the face of supernatural danger.