The hunt for a methodical killer takes the BAU to Arizona to search for an increasingly devolving unsub, and the team speculates that Hotch is in the running to be the new BAU Section Chief following the death of Erin Strauss.

As the BAU zeroes in on the suspect of the ritualistic killings they've been investigating in Arizona, a bizarre connection within the unsub's family could lead them to finally nab the suspect.

When a sniper strikes Dallas, the BAU investigates whether the upcoming anniversary of the Kennedy assassination is a motivating factor or if something else is driving the unsub.

The BAU meets their new section chief, Mateo Cruz, who, unbeknownst to them, shares a long work history with JJ. Cruz joins the team as they comb the streets of Baltimore for an unsub who leaves victims unable to communicate.

As Hotch fights for his life due to complications from his stabbing at the hands of George Foyet, a.k.a. "The Reaper," he experiences visions of his late wife, Haley, and his nemesis, Foyet. Meanwhile, the BAU searches for a missing teenager and investigate her estranged father as a suspect in her disappearance.

When the BAU investigates victims of possible ritualistic murders in Utah, clues lead them to believe that the unsub they are looking for might have a fascination with the Salem Witch Trials. Also, Garcia prepares for a "Day of the Dead" celebration at her apartment.

After a series of victims are found strangled to death in Boston, the BAU looks for an unsub who likes to keep mementos of the victims, and the team wonders if a common link to the casualties could lead them to the culprit. Meanwhile, the BAU rallies around Rossi when his favorite bar is on the verge of closing.

When teenagers who were reported missing are suspected of a series of mass murders in Chicago, the BAU investigates their whereabouts to find a motive for the crimes. Also, Morgan has conflicting feelings when his girlfriend takes her job at a hospital as seriously as he takes his.

When skeletons are found in the backyard of a Virginia home, the BAU centers its investigation on the family living there, unearthing family secrets rooted in the past racial divisions in the South.

When a young boy goes missing from his home in St. Louis, the BAU re-investigates a similar cold case to search for the unsub.

When the BAU is called to Kansas City to investigate a series of murders, a tense reunion ensues between Blake and her father, a retired police captain, and her brother, a detective, who must work together to help solve the crime.

When the BAU goes to San Jose to investigate a string of murders, Garcia delves into her hacker past and reconnects with her old flame to help the team with the case.

While the BAU looks for a vigilante killer on the loose in Cleveland, Rossi is concerned when his former Marine sergeant goes missing and heads to Los Angeles to find him. Also, the secret JJ has been keeping from the team may be catching up.

When JJ is kidnapped, the BAU delves into her time at the State Department to find clues to her disappearance and uncover a secret mission that now puts her life in danger. To help with their search for JJ, the team calls upon Prentiss to help in the crisis.

The BAU travels to Pittsburgh on the hunt for a pair of suspects that appear to be working together as a team; Garcia and Morgan reveal their Valentine's Day plans for their respective significant others to each other.

When a 4-year-old girl goes missing while staying with a relative in Mississippi, the BAU uncovers some startling truths as the team races to find the child and bring her to safety.

Mysterious drowning deaths discovered in the Las Vegas desert have the BAU trying to figure out the true cause and motive for the murders.

When three bodies are found with animal and human bite marks in a shallow grave near Milwaukee, the BAU has puzzling questions to answer. Meanwhile, Reid and Garcia work out for a company fitness test, but try to hide their preparation from Morgan.

Unusual stabbings in Upstate New York are investigated. Just as the probe wraps up, Morgan visits one of the crime's survivors and realizes that all of the questions in the case aren't yet answered.

Two murder victims are found in a West Virginia backwoods community. The investigation reveals that the homicides may be linked to a long-simmering feud between two families.

A series of targeted kidnappings near Memphis have the BAU searching for a commonality between the missing persons and a motive to lead to the UnSub. Meanwhile, Savannah vents her frustration to Morgan about the amount of traveling he does for his job.

Victims of arsenic poisoning are found in Long Beach. The investigation reveals that the killer has a fascination with Greek mythology, based on handwritten death threats to the deceased and other mysterious clues. Meanwhile, Hotch becomes concerned about participating in Jack's third-grade career day.

When the BAU is called to Texas to consult on the murders of prostitutes, evidence points to killings with religious overtones. But as they delve further into the investigation, the team members could place their lives at risk.

The BAU continues its murder investigation in Texas, and clues uncover a deep web of corruption that could be the motive for the killings. As one team member's life hangs in the balance, another concerned BAU member must face a sad secret from the past. Garcia is thrust into action to save a colleague.