Sorcerous Sea

From the back cover of the Del Rey first edition: "Sea change - With war a distant memory, life on the islands should have been one of peace and plenty. But something evil was reaching out from the ocean depths and spreading unease across the land. Strange sightings at sea were being reported with increasing frequency. Children had gone missing from both the islands and the mainland. The sea folk were disappearing as well, and a lack of food in the open sea was driving more and more large sharks closer to shore. Even Iuti Mano, kin to the sharks, and her lover, the sea mimic had no idea what was happening in their beloved sea. And suddenly the evil took on special - personal - meaning for them when their own son, along with Iuti's adopted daughter had joined the ranks of the missing children. Once Iuti had killed the shark god to save his realm from evil - but in doing so she had upset the balance of power in the sea. Now it was up to her to restore the balance..."