Anni Tidechild lives on Pel Narine, one of the floating islands of Salila. An orphan, Anni is under control of the ruler, Wavelord Filip Able. Struggling with her family's past and lost within her own life, Anni's world is on the brink of change. Because someone or something is calling to her. When she meets Duck Knifetooth, son of the famed Wavemaster Adamson Knifetooth, the new friends are catapulted into danger. Pirates, the last giant, a magic ship and cretaures of the deep. But always in the back of her mind is the question: Who is friend and who is foe?