When the rare Blue Moon rises over Windmere Bay, Evelyn Monroe faces the same mysterious force that stole her mother thirteen years earlier. Drawn to the cliffs by haunting whispers, she discovers an ancient presence beneath the sea the Lady of the Tides, a being who feeds on loss and longing. With Nathan’s help, Evelyn uncovers her mother’s fate and confronts the darkness beneath the waves. Through courage and love, she breaks the curse binding her family and the town. The Lady is defeated, her mother’s spirit freed, and the sea itself falls into a long, peaceful sleep.