At the family home in Louisiana, FBI Special Agent Aloysius Pendergast is laying to rest his wife`s possessions - a job he`s been putting off since her tragic death twelve years ago. But whilst examining her property, he makes a startling discovery - one that leads him to believe Helen`s death was not With the help of his trusted friend Lieutenant Vincent D`Agosta, Pendergast embarks on a quest to uncover the mystery of his wife`s final days. It`s a journey that takes him deep into the dark heart of her past, to a hidden obsession and top-secret information that some people would do anything to protect. But as the hunt for Helen`s murderer ventures into the Bayou, Pendergast find himself faced with a killer question: just who was the woman he married?