: He uses military-grade tactics and a professional hit squad to execute his targets.
The episode begins with a series of seemingly unrelated home invasions and suspicious deaths in the Washington, D.C. area. While local authorities initially suspect murder-suicides or accidents, the BAU quickly identifies a more professional and calculated pattern. The victims—members of the Cosenza and Fagan families—all share a common history: they were once part of a private counterintelligence group known as Clear Water Securities (CWS). [S6E17] Altar-ed State of Mind
As the investigation unfolds, Emily Prentiss begins to realize that these are not random acts of violence. Instead, they are the opening salvos of a vendetta by her old Interpol archenemy, Ian Doyle. Doyle, a former IRA terrorist known by the moniker "Valhalla," has recently escaped from a political prison and is systematically hunting down the seven operatives responsible for his capture years ago. The Profile of a Ghost : He uses military-grade tactics and a professional