This is an amazing book! From the very beginning, I was hooked!I love stories of mermaids, unknowing powers, and girl who hold the very key to everything. Love this book. So much going on in the book that it captures the reader. I loved that Emma is strong with all the news that is presented to her. Man can this girl fight!Now, the love interest.Can I say major drama??? Yes indeed. Emma goes through some rather crazy rules that she must abide by. They have lots rules and even standards. This creates a rather great build in the story. I like learning facts about this underworld, the society, and the way that they do things. I especially love watching Emma learn everything and falling in love.The best part of the book for me is learning the secrets. I love secrets! Emma learning who she really is but OMG! Who her mom is like BAM! I totally gasp at the end of the book. So cool! Ms. Bank took my breath away with that tidbit.Of Poseidon delivers a wide range of fantasy and love! The revelation of secrets, the touch of power flowing through Emma and what she is meant to do entices the reader the keep reading. The perfect combination of suspense, action, and love leaves the reader wanting more. Of Poseidon is tantalizing!