Lena has waited seven years for marriage, only to discover on the wedding eve that Julian, her merman fiancé, has already tied himself to Selene through a secret tide-bond ritual. Shattered by the betrayal, she calls off the ceremony and walks away. Once the truth is exposed, Julian and Selene pay dearly for what they did. Lena, meanwhile, rebuilds her life, advances her career, and meets Adrian, whose respect opens the door to a new beginning. Even when Julian returns with desperate pleas, she no longer chooses him.