She is the last siren on earth. She has lived for almost two thousand years. But now, she fears for her existence. More and more, sport scuba divers are taking dive trips to The Great Blue Hole of The Caribbean, unaware that "The Hole" is the siren's lair.
She hatches a plan. In her mind, if she can kill everyone aboard a dive boat at The Great Blue Hole, she will create fear of the location, and visitors will stay away. Will it work? Morphed as a beautiful woman, she joins a dive safari group along the Texas coast that is bound for Lighthouse Reef and The Great Blue Hole. She feels that by working 'from the inside' she can easily kill every person on board, one at a time. Will her plan work? The main fly in the ointment is none other than a twelve year old boy. Can he stop her murderous fury? If he can't, everyone aboard the pleasure craft, SIREN SONG, is doomed.