As the team searches for a vigilante killer in Cleveland, Rossi's former Marine sergeant goes missing in Los Angeles; J.J.'s secret catches up with her.

The BAU searches Tallahassee for a serial killer who calls the authorities to report the crimes prior to committing murder. Also, as Rossi prepares for a weekend visit with his daughter, Joy, he receives startling news about the death of a comrade in Vietnam.

When brides-to-be in Savannah are killed on the eve of their nuptials, the BAU suspects a jilted UnSub is at work.

The BAU heads to Wichita in search of an UnSub abducting children while their parents sleep. Also, Morgan tries to find who was responsible for his attack.

The BAU team opens an investigation when a man who fully believes he’s Dr. Tara Lewis’ brother arrives in town, knowing everything about her and her family, and she is unable to make contact with her real sibling.

Three victims are found tied to stakes in the Arizona desert.

When two members of a conspiracy group in Roswell, N.M., perish in quick succession, the BAU is called to investigate.

The BAU travels to Chicago to investigate an unsub who leaves red roses on each victim. Also, Rossi gets an unexpected visit from his ex-wife, Krystall Richards.

The BAU heads to Bethesda, Md., to investigate four murders in the span of three days along the eastern seaboard. The crimes become personal for Alvez, when the team discovers there are ties to his time spent five years ago working alongside the DEA and the Mexican police force in pursuit of the most notorious hitman in Mexico. Alvez and his girlfriend decide to move in together.

At the heart of the serial killing network is Elias Voit. Dangerous psychopath. Manipulative narcissist. Loving father and husband. In order to find him, the team must find all of his kill kits. But one is missing, and the path leads to a bomb in the middle of Washington, D.C.