Shea MacNamara's life just got complicated... When a freak tornado devastates his Oklahoma farm, fifteen-year-old Shea moves to Cape Cod to live with a grandmother he's never met. Struggling to make sense of his new surroundings, he meets a girl along the shore who changes his life forever. Kae belongs to an undersea world hidden from drylanders, where bloody war rages between opposing clans. A fragile peace accord hinges on marriage between the royal families, but treachery and magick lurk in every shadow. With Kae's help, Shea discovers his true heritage and finds that his destiny lies somewhere far below the ocean's surface.

Mermaid blood. When Shea MacNamara fell into the ocean for the first time, he found he could breathe underwater. The son of a mermaid, the sea is in his blood. Literally. The best part of Shea’s new life? His girlfriend Kae, who also happens to be a beautiful mermaid. But darkness lurks under the sea. When evil mermen kidnap Kae, the king reminds Shea that having royal blood means making tough choices. An Arctic dungeon, a fiery plane crash, the legendary halls of Atlantis…and narwhals? Having mermaid blood just got a lot more complicated.

For Shea MacNamara, life under the sea has never been more complicated. Months after being captured, Prince Demyan remains on trial for his crimes while continued unrest stirs among the clans. Tensions mount between Shea and his friends as they unravel lies that bring identities and loyalties into question. The deceptions of both the past and the present have implications for everyone's future. And at the root of everything... the magick that binds the undersea world together.