Emile and his brother Cecil live a calm, predictable adult existence. Everything is orderly and without disruption. Suddenly, it isn't. With the death of their mother and the loss of her guiding wisdom, Emile finds it increasingly more difficult to keep his brother safe. In their most challenging of cases to date, Detectives Rosie Young and partner Vince Mendez embark on a race against time to stop one of San Antonio's most cunning murderers, a villain with a particular talent to strike and kill but leave only pristine crime scenes in his wake. With the help of clinical psychologist Dr. Chris Parker, Rosie and Vince journey into the mind of a serial killer to understand exactly what type of monster roams their city targeting dads of small boys. The question both detectives and Dr. Parker must answer is what emotional baggage creates a deranged mind that suddenly transitions to cunning killer and eludes the best of police forensics. Scant crime scene evidence and a mounting body count spur Rosie and Vince to use every tool at their disposal to pursue the perpetrator before he kills again.