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The team investigates an incident that caused mass casualties in New York City; Maggie finds herself questioning her co-worker's seemingly troubling behavior.

The team investigates an incident that caused mass casualties in New York City; Maggie finds herself questioning her co-worker's seemingly troubling behavior.

The team investigates the death of a young woman; Crosby is brought onto the case after it is learned the suspect worked in the Army with him.

A dangerous hacker disables live-saving equipment at hospitals across New York as the team wants to investigate the deaths of psychiatric patients.

Isobel wants OA to ask an old Army friend for information regarding a private veteran's club in New York City that is connected to government agency bombings.

The team searches for a serial killer who specifically chooses young, homeless men as their victims; Tiffany and Scola fail to come to an agreement.

The team exposes the darker parts of a seemingly perfect marriage after a woman is kidnapped; OA feels coerced into changing his career path.

When a patient dies after being prescribed the wrong medication, Pratt and Hope question their culpability; Dr. Kovac is forced to make budget cuts.

The attention Abby lavishes on a patient causes Kovac to become jealous; Pratt is put under arrest following the death of one of his patients.

Gates and Neela find Meg unconscious in her car and attempt to resuscitate her; Sam believes she knows the identity of the person who set fire to her home.

Abby and Sam attempt to discover the cause of an aspiring comedian's unusual symptoms, while Pratt is questioned over a patient's death; Neela's kidney surgery.

A woman's acute liver failure causes a moral dilemma for Gates and Kovac; Neela examines the differences between right and wrong when Manish donates his kidney.

After getting stranded in the snow, a family suffering from frostbite seeks aid from Abby and Pratt; Dr. Dubenko's new intern causes Neela to become jealous.

The BAU is against the clock as they attempt to capture a collection of vigilantes who are behind attacks in Washington, D.C., that occur every 27 minutes.

The BAU lands in New Hampshire to investigate a double homicide and kidnapping case; Rossi's plans to progress his relationship with Krystall go awry.

The BAU is warned by a professor who Lewis met on a previous trip about a disconcertingly large number of patient deaths that resulted from overdose.

The team investigates the murders of multiple prominent businessmen who had their hearts removed; Prentiss prepares for a romantic first date.

The team arrives in Portland, Ore., to investigate a disturbing abduction that could have a connection to a couple who was murdered in their home a week before.

Prentiss and the team visit Iowa to examine a group of three missing 10-year-old children who seem to have been taken from their homes at night.

Rossi is uncertain if he made the appropriate calls in the wake of a near-death conflict with a serial killer who seems to have outplayed the BAU.

The team sets off for Lewiston, Maine, to investigate a series of murders that are occurring in what are assumed to be haunted houses.

The team visits a family-owned night club while investigating a petty officer's murder; Lasalle gets an unexpected call from his family and rushes back home.

A petty officer trying to help a family of refugees is murdered; Wade works on the mayor's special election campaign, which happens to be during Mardi Gras.

An FBI special agent needs Pride's help with an investigation into opioid theft; Percy goes undercover with Isler as the backup for a job related to the case.

The NCIS team investigates a missing congressional aide; Lasalle has a difficult time with making life-altering choices that will affect his brother's future.

The team looks for a shooter who chooses detectives from the same individual precinct and unit; Tiffany discovers that she could have an unintentional bias.

The team helps the parents of a kidnapped young girl work around a dangerous debt; Maggie is distracted by the case after her sister comes back from rehab.

The team exposes a terrorist plot while investigating a widow; Scola reflects on the 9/11 attacks as Tiffany worries about his emotional state.

On a seemingly normal day going into work with Jubal, Rina is seriously injured, and the team discovers that Vargas has been organizing a revenge campaign.

A rash of jewelry store thefts end in a double homicide and the investigation to find the perpetrator uncovers a connection to a teenager in foster care.

A college co-ed goes missing and is feared to be abducted, so Jubal focuses on getting any information he can from the father of the abductor's previous victim.

An anti-government group suspected of bombings holds regular meetings at a bar, so Maggie goes undercover at the establishment to investigate further.