The Restless Shore — James P. Davis

One hundred years ago, the Akanamere was ravaged by the Spellplague, drying the lake and leaving behind a nightmarish landscape of frozen waves, distorted creatures, and a strange being whose song drives listeners to carry out what they believe are the singer's orders. When a genasi girl is kidnapped by these fanatics, her troubled sister must brave the wilds of the Mere-That-Was to save them both from an gruesome fate.