The team travels to Glendale, Arizona to search for an increasingly devolving killer.

The team return to Arizona to restart the search for Wallace.

On a lunch hour in crowded Archer Plaza in Dallas, Texas, a sniper, firing twelve shots, manages to kill six people. The BAU has to figure out if it is a random attack, a targeted attack, a terrorist attack - homegrown or foreign - or even something related to the upcoming fiftieth anniversary of the shooting death of John F. Kennedy. The six unrelated victims were killed in different parts of the plaza, the remaining six bullets splattered elsewhere throughout the plaza, leading to the team initially believing that it was a random attack by someone who was a bad shooter. But the nature of the six killed leads them ultimately to believe that the sniper was indeed an excellent shot, with the six non-fatal bullets being red herrings. They have to look at the backgrounds of the six dead to see who was the intended target or targets. Reid is able to narrow the target list to three, and most likely no more than two, the remaining victims being collateral damage. When a second sniper shooting occurs at a gas station leaving three more dead, the theory that it was a targeted hit is strengthened based on the location of the shooter in relation to the station itself. They have to find a connection between whoever the target(s) in the first shooting to whoever the target(s) in the second shooting to at least find the unsub's motivation. Even if they are able to find the connection, discovering the identity of the actual sniper may be a little more difficult.

The team searches for an Unsub who lobotomised his victim.

The BAU race a father who kidnapped his daughter to the border while Hotch has visions while fighting for his life in surgery.

The BAU are called to Utah to investigate the murder of a woman who died by being buried under stones. All while Penelope plans a Day of the Dead party.

Though Rossi is sad because his favorite bar is closing, the team goes to Boston to solve a series of strangulations.

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.

While fixing a burst water main, a city works crew digs up the back yard of the home of the Johnsons - father Charles, mother Tina, and their middle aged son Lyle - upon Tina's approval. The Johnsons have lived at the house for thirty-five years. The crew finds the skeletons of two human bodies buried in the yard. The BAU takes the three members of the Johnson family in for questioning, who they believe know something about the skeletons, primarily because Lyle ran when he saw the authorities at the house. While Hotch, JJ, Morgan, Rossi and Cruz question the Johnsons individually, Lyle initially comes across as the most guilty by his animosity, however the team eventually believes his attitude is more a facade hiding other issues. Charles also demonstrates a more reserved form of animosity, he being a history buff who continually implies how he and his family, as being black, have been persecuted, this situation being no different. The identification of the two bodies and of the others which are eventually found in the yard, in addition to what Reid and Blake are able to find in the Johnson house may piece the puzzle together. Meanwhile, JJ wants to divulge to the team the fact that she and Cruz have been on special assignment, against Cruz's wants.

The BAU heads to St. Louis, Missouri where ten year old Andrew Taffert has gone missing. The reason it is a BAU case is that the Tafferts - father Malcolm Taffert and mother Lida Taffert - had been receiving prank calls from someone with a childlike voice stating "I'm gonna get you", and that blood was splattered on their front door after Andy had gone missing. Reid notices that this case is much like a fifteen year old cold case that the BAU worked on where the parents in that situation received such prank calls prior to their son being abducted and eventually found dead. The father in that case, Richard Clayvin, was always considered a suspect. As such, Malcolm is initially considered a prime suspect, especially considering his over controlling temperament. The similarity between the two cases extends to the post-abduction prank calls with the voice changing its statement to, "Did you see what I did?". But as the investigation progresses, which includes re-interviewing Richard Clayvin, the team may have to find other similarities before they can identify 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 a murder investigation opens in San Jose, Garcia is forced to delve into her past as a hacker and reconnect with her former boyfriend to help the BAU solve 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 with her.

The BAU call Emily Prentiss for help to find JJ, who has been kidnapped. The truth about JJ and Cruz's past is revealed.

When the BAU investigates several murders in the Pittsburgh area, the team searches for a pair of UnSubs working as a team. Also, Garcia and Morgan share their Valentine's Day plans for their respective significant others.

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.

When mysteriously drowned bodies are discovered in the Las Vegas desert, the BAU tries to figure out the true cause and motive for the murders.

The BAU travels to Milwaukee when multiple murder victims are found in shallow graves, with no apparent cause of death.

As the BAU wraps up an investigation into unusual stabbings in upstate New York, Morgan's visit with a survivor could uncover more questions left for the team to answer.

When the bodies of two murder victims are found in a backwoods community in West Virginia, the BAU uncovers a long-simmering feud between two families and must investigate which one of them could be responsible for the deaths.

When 3 unrelated people, of different ages and gender, are kidnapped the BAU races to find the connection and find them before the Unsub kills them.

The BAU must track down a killer who sends their victims a warning before poisoning them with arsenic, without ever seeming to come in contact with them.

The BAU is called to Texas to consult on the murders of victims with links to prostitution.

When Reid is in serious condition after the shootout with the Preacher, the BAU begins to investigate the Sheriff's Deputies.