Morgan and the BAU team are called to Detroit, where they must help a fire department chief track down a serial killer who kills during a pre-Halloween event.
The first responders race to three different scenes; Bobby is given startling news from Buck; Eddie helps Christopher face the aftermath of the tsunami.
The 118 responds to two urgent situations that involve protestors at a slaughterhouse and a wife who is trapped inside a room with her husband's mistress.
Beedy becomes upset with Toya and Mel's discussion; Reginae works on her new film; Walter goes to his daughter's graduation; Casey seeks a favor from Toya.
The team works with the FBI after a car bombing ties back into a terrorist group planning a major attack in Los Angeles; tragic memories of Deacon's past.
Classified information leaks and endangers the lives of former U.S. military members; Luca has to make a difficult choice after a family member gets sick.
BAU searches for a killer targeting women inside a gated New Mexico community; Hotchner looks to a FBI cadet with a unique past to help in the investigation.
Morgan believes a man has been rehabilitated in prison and helps with his parole, but soon regrets that decision as the man kills again days after his release.
BAU hits the road to track down a pair of young lovers on an interstate murder spree; Prentiss hears some frightening news from her former boss at Interpol.
When three women are found murdered in a similar manner, the BAU heads to Los Angeles to investigate the strange deaths; Emily Prentiss' past is revealed.
The team works with the DEA for a gang sweep, but a new cartel's arrival in the city threatens massive destruction; Hicks passes an important anniversary.