Bonnie joins her marine biologist father on what is meant to be a short excursion, yet soon turns into a nightmare. Monsters from below lurk and rise to the surface: it feels like they are calling for Bonnie. And although the young woman cannot explain why, she finds herself compelled to follow them into the ocean. Soon, Bonnie is jumping into an active whirlpool, as she disappears beneath the surface, deep into unknown waters. Will this be the end of her adventure, or just the very beginning of a journey untold?