FBI Agent Gardner Camden is an analytical genius with an affinity for puzzles. He also has a blind spot on the human side of investigations, a blindness that sometimes even includes people in his own life, like his beloved seven-year-old daughter, Camila. Gardner and his squad of brilliant yet quirky agents make up the Patterns and Recognition (PAR) unit, the FBI’s hidden edge, brought in for cases that no one else can solve. When DNA links a murder victim to a serial killer long presumed dead, the team springs into action. A second victim establishes a pattern, and the murderer begins leaving a trail of clues and riddles especially for Gardner. And while the PAR team is usually relegated to working cold cases from behind a desk, the investigation puts them on the road and into the public eye, following in the footsteps of a killer.

In the years since the mysterious deaths of his wife and child, police detective P.T. Marsh has faced demons --- both professional and personal. But when he is called to the scene of a school shooting, the professional and personal become intertwined, and he suspects that whoever is behind the crime may be connected to his own family tragedy. As Marsh and his partner Remy investigate the shooting, they discover that it is far from straightforward, and their search for answers leads them to a conspiracy at the highest levels of local government --- including within the police force. The stakes in the case become increasingly high, culminating in a showdown that has Marsh questioning everything he knows.

A hard-nosed real estate baron is dead, and detectives P.T. Marsh and Remy Morgan learn there's a long list of suspects. Mason Falls, Georgia, may be a small town, but Ennis Fultz had filled it with professional rivals, angry neighbors and a wronged ex-wife. As Marsh and Morgan dig into the case, it becomes clear that Fultz's death was not an isolated case of revenge. It may be part of a dark web of crimes connected to an accident that upended Marsh's life a couple years earlier --- and that now threatens the life of a young child. Marsh veers dangerously off track as his search for clues becomes personal...and brings him to a place where a man's good deeds turn out to be more dangerous than his worst crimes.

Detective P.T. Marsh, the former rising star of the Mason Falls, Georgia, police force, decides to help out a woman by giving her abusive boyfriend a taste of his own medicine. The next morning he gets called to the scene of his newest murder case, and is stunned to arrive at the house of a dead man, the very man he beat up the night before. As P.T. and his partner, Remy, begin to suspect the murder is connected to a local arson and the lynching of a teenage boy, P.T. realizes he might have killed the top suspect of this horrific crime. Amid rising racial tension and media scrutiny, P.T. uncovers a conspiracy leading all the way back to the time of the Civil War.