A fearless trio of nuns is out for revenge. After being wronged by ruthless men, they trade their habits for high-powered weapons, taking justice into their own hands.

Serena, a mysterious woman with a dark secret, arrives in a coastal town where men mysteriously disappear. Local journalist Dylan falls for her, unaware of her ties to deadly sirens who lure and kill. As Dylan and his brother Connor investigate the disappearances for a story, Connor's jealousy and obsession with Serena lead him to a deadly encounter. The brothers’ quest to uncover the truth places them in a perilous clash between love, betrayal, and ancient horrors lurking beneath the sea.