A fantastic addition to the genre of mermaids, this book will also appeal to readers of action and those who appreciate usurped leaders taking back their kingdom. It starts with a common enough concept: a royal girl who is worried about her betrothal and about love. Donnelly then adds layers of complexity to the tale and weaves her story into that of Atlantis. Friendship, trust, and responsibility are major themes as Sera struggles to grasp that she is really her kingdom's only hope. Quick-witted, loveable characters and a well-planned fantasy world make this an all-encompassing book. Readers will eagerly await future volumes and the answers they will provide.--VOYA
A richly imagined novel. Themes of conquering fear and believing in oneself are woven throughout, along with an acknowledgment of humans' environmental impact on the sea and its inhabitants. Despite the high stakes and a few frightening moments, the story is never overserious; it's just right for readers who have grown up with, but aged out of, The Little Mermaid and the Disney Fairies franchise. --Publishers Weekly
Best-selling Donnelly (Revolution, 2010) builds an alluring mermaid civilization and history, filled with painterly descriptions of Sera's underwater palace and its unearthly architecture, her sumptuous wardrobe, and the menagerie of half-human, half-marine animal denizens. There's also plenty of romantic tension with handsome mermen, strife between merls (that's girl mermaids) from rival regions, and some powerful female friendships amid the fast-paced plot, filled with wondrous magic.--Booklist