Serafina is the principessa of an underwater kingdom called Miromara. Today is one of the most important days of Sera's young life. She needs to confront a terrifying monster and even worse, her entire kingdom and convince them that she's their rightful ruler.

And suddenly, everything goes wrong and Serafina finds herself fleeing for her life with her best friend Neela. The two need to survive in a treacherous and lonely waters when they can trust no-one but themselves. It turns out that Neela and Serafina are two of six mermaids who have the powers and heritage that could save the entire ocean from an awful evil.

This isn't a story about pretty mermaids (though it helps!), magic, or even a deep-sea adventure. But the love and trust between a group of friends and how they will fight for what's right and what they believe in. Serafina and Neela, underneath it all, are a pair of teenage girls who would much rather be worrying about eating zee-zee's and Serafina's betrothed Prince Madhi. The glimpses of youth and slight immaturity in the book are refreshing in my opinion, as it shows the true nature of what would happen if a bunch of teen girls were thrown together to save their world. The lack of merman isn't too disappointing but I'm holding out hope for rouguish outlaw Blu to reappear.