Defiance (Son of a Mermaid)

Shea MacNamara sank to the bottom of the ocean and survived. As the son of a mermaid, saltwater is in his blood. He discovered a whole new world under the sea, one more beautiful and complicated than he ever imagined. But shadows and dark secrets also lurk beneath the waves. When his girlfriend Kae is kidnapped by a powerful young sorcerer named Zan, Shea learns having royal blood means difficult choices. All three face life and death decisions, balanced precariously between doing what they are told… and defying authority to do what is right.