FBI Agent Ella Dark has studied serial killers from the time she could read, devastated by the murder of her own father. With her photographic memory, she has obtained an encyclopedic knowledge of every serial killer, every victim and every case. But when a serial killer strikes in the swamps of Louisiana, Ella soon comes to learn that the real thing is like nothing she ever expected. FBI Agent Ella Dark, 29, is given her big chance to achieve her life’s dream: to join the Behavioral Crimes Unit. Ella’s hidden obsession of gaining an encyclopedic knowledge of serial killers has led to her being singled out for her brilliant mind, and invited to join the big leagues. But face to face with a real murder, a real killer, and a real ticking clock, Ella realizes she can’t rely on her knowledge. She must learn to trust her instinct, and allow herself to enter the dark canals of a real killer’s mind. If she gets it wrong, her career is at stake. And so is the next victim’s life. Will Ella’s talent be an asset? Or the source of her downfall?