This book is full of deadly sirens who collect the hearts of princes, vicious mermaids, shark beasts, and other creatures of the deep that will send a shiver down your spine. There is also a siren-hunting pirate in the mix. As royalty from multiple kingdoms (both land and sea) fight for power, a fate-twisting adventure ensues. This book ponders what the notion of home means, which alliances are worth fighting for, and what it means to be human. For ages 13+.