Plot

The unit has to deal with the militia when they're called to rural Montana to track a killer who's obsessed with his mentor.

In Montana, a member of a local militia, Frances Goering, is identified as a sadistic serial killer. He then commits suicide by blowing himself up, taking a cop with him. Goering's M.O. was kidnapping young women, torturing them for a few days and then killing them. By the time of his death he had killed 3 and held another captive. The BAU is called in to locate the survivor and finds her freshly killed, meaning Goering had an accomplice who now has literally taken his identity...—J. Rieper

The serial killer and serial rapist Francis Goehring is cornered by the police shortly after abducting his fourth known victim. He commits suicide with a grenade, fatally injuring a veteran police officer in the process. The FBI take some time to realize that Goehring was not working alone, he was actually the dominant partner of a two-person killing team. His sidekick Henry Frost hallucinates that he is talking to Goehring's ghost and that he is in the process of transforming to Goehring. He dyes his hair to match Goehring's hair color, he attempts to replicate Goehring's facial scar, and he kidnaps a woman who fits Goehring's taste in victims. But Frost is decades younger that Goehring, and he lacks Goehring's military training and capacity for planning. Frost's impulsive decisions result in his own violent death.—Dimos I

Rossi, who had been on retirement writing books but who has now returned full time to the BAU, is grilled by his new colleagues, some of whom have never worked with him before this return, as to the reason for his coming out of his lucrative retirement, his answers which are vague. The next case on which he will work with the team concerns four young, brunette women who have gone missing from Great Falls, Montana over the past fourteen months. The car belonging to the latest missing, Angela Miller, is spotted forty minutes after her disappearance. The car is driven by a man named Francis Goehring, who purposefully blows himself, and the car, up with a grenade when cornered by the police. Angela's body is not found in the wreckage of the car. Goehring's background, the fact of the grenade and the area of the country suggest that the militia is involved, which will not make it easy for the team as the FBI is seen as the enemy. All the missing women look like Goehring's ex-wife, making the crime personal to him. However, the BAU come across some evidence which makes them realize that Goehring was not working alone. Thus the young women of the area are not yet safe despite Goehring's death.—Huggo