Step into Anita's world as she tags along on her father's expedition in search of Atlantis. Since the arrival of the team's newest member, the hotness known as Riley, an unexplained song haunts Anita's dreams, and soon thereafter her waking hours. The siren's song, a sweet and hypnotic melody, unleashes zombie-like mermaids turned human bent on revenge and plagued by madness. When the sirens lure the mortals to the labyrinth tomb of Theoisis, Anita faces the demons from her nightmares. Trapped underwater and at the mercy of an undiscovered race, Anita must fight in order to save her father. A series of horrific murders set the pace for an unprecedented escape from the siren's hold as Atlantis' protector, Riley, struggles to imprison the sirens before they reach land.