Alexa "Lexi" Giguere goes searching for her sister Kate, who disappeared six years earlier. She enlists the help of her two best friends, fellow college students, Caleb and Tess, to investigate the disappearance. But what Lexi discovers, leads her to the North Shore Island and turns her entire world upside down. She encounters mythological creatures she never knew existed. She can feel the clock is winding down as she tries to find her sister before her and her friends end up victims of the strange creatures they encounter.