Marie is confident that her senior year in High School will be her best one ever. That is, it would have been, if a chapter of Marie's past had remained closed. High School soon becomes the least of her worries when Marie finds more adventure than she could ever imagine. Forced to come face to face with her biggest fears, and the possibility that one of her friends may not live through the school year, she also comes face to face with a creature of myth. Dorian is a young merman that doesn't know when to just say "no" to a dare and leave humans alone. Later, when an assignment from his teacher leads to a daring chase through the shallows, his curiosity (and a low tide) forces him to the surface world and to certain death. Luckily a human sees him and comes to his rescue... except that humans are cruel and will torture and kill him on sight, or so he was taught to believe. Challenging the teachings of his culture, Dorian is driven to uncover the truth, even if it takes him to the bottom of the ocean or inside a whale.