Eighteen-year-old Lorelei Clark was a gifted singer at a music conservatory until the day her father was struck by an oncoming car. His death leaves her emotionally shattered, so when she receives an invitation from her great-aunt Helen to visit her home in Cape Cod, Lorelei accepts. She quickly discovers that Helen and her two nieces are harboring a frightening secret - they are sirens, terrifying mythical creatures responsible for singing doomed...