The Hotch and the team investigate the murders of homeless men in San Francisco, and they work with a separate BAU group handling a case that may be connected to the deaths. Forest Whitaker guest stars.
Away from the watchful eye of the FBI's assistant director of national security, Linda Barnes, the BAU meets in secret to investigate an UnSub who appears to be kidnapping and photographing young women.
The Centers for Disease Control calls on the BAU when they suspect bioterrorism is behind a series of mysterious deaths in Virginia. Also, Garcia visits her stepbrother, Carlos, to take care of a difficult family issue.
When Reid discovers former FBI Special Agent Owen Quinn locked inside a storage unit, the BAU questions the credibility of Quinn's bizarre accounts of searching for an UnSub that he named "The Strangler." The Season 13 finale.