The BAU believes two unsubs may be operating at the same time, when victims killed in two drastically different ways are discovered in the same city. Also, the team grapples with keeping Reid safe in prison.

The BAU is called after three victims are found tied to stakes in the Arizona desert.

A grisly murder investigation leads Castle and Beckett to a suspect who claims he's traveled back in time to stop terrible events from unfolding.

Castle and Beckett investigate the bizarre murder of a young woman who was found ritually posed. When the team finds a collection of strange symbols in her apartment, Castle becomes convinced they’ve stumbled onto a 'Da Vinci Code' style conspiracy.

Booth and Brennan's next case leads them to a crime scene where a human carcass has literally melted into the dashboard of a charred truck.

The body of a brilliant and career-driven surgeon is found in a rough neighborhood with multiple fractures in her skull and no indication as to how or why she was there.

A mother steps forward with valuable information for the BAU to aid in their investigation of an unsub known as the bone crusher. Also, Reid must adapt to a new set of rules in prison life.

The BAU investigates an urban vampire in New York who kidnaps his victims at night and holds them underground in the sewer system. Also, Reid makes an impossible decision in prison that severely affects himself and other inmates.

When several federal government employees, including a close friend of Walker's, succumb to symptoms of a heart attack, the BAU investigates. Also, Reid anxiously awaits his trial date.

Harrow is reminded why he hates camping on a hiking trip with Fairley and Nichols, but things turn strange when the trio find themselves conducting an impromptu murder investigation and a life-or-death battle.

As Harrow's attempts to reconnect with his son are frustrated, Fern and James grow closer - while the baffling deaths of two teens sharpen Harrow's concern for his own children.

Booth and Brennan's next case leads them to a crime scene where a human carcass has literally melted into the dashboard of a charred truck.

The body of a brilliant and career-driven surgeon is found in a rough neighborhood with multiple fractures in her skull and no indication as to how or why she was there.

Will disappears after an attack, prompting the team to search, while he's trapped and trying to escape, complicating his complex relationship with Angie.

When Colter finds a lost dog at a gas station in Denver and the dog is subsequently stolen from his truck, Colter makes it his mission to track him down and reunite him with his family.

Harrow is reminded why he hates camping on a hiking trip with Fairley and Nichols, but things turn strange when the trio find themselves conducting an impromptu murder investigation and a life-or-death battle.

Castle and Beckett arrive at a crime scene to discover that the female victim bears a shocking resemblance to Medical Examiner Lanie Parish.

While pressure mounts on Harrow to stop defending his son James, two baffling deaths demand all his wit and courage to solve - before another life is lost.

The mysterious death of a hotel maid draws Harrow into a dark world of espionage and assassination, while Nichols edges closer to catching Harrow's wayward son James.

After two men die in a duel, Harrow uncovers a web of Machiavellian intrigue within a suburban historical society. Meanwhile, the return of Tanya forces Harrow to reassess the last twenty years of his life.