When the police discover a series of women found dead in rural Indiana cornfields, the BAU is brought in to find the serial killer. As it turns out, the UnSub is actually a pack of three murderous college students. As the FBI closes in, our team must find the pack before the leader kills his two partners and eludes the law for good.
When the BAU are brought the case, they are told that three previous girls have gone missing from the strip clubs they work at on Friday night and are found dead in a cornfield on Sunday. A fourth girl, Stephanie Wilson, was abducted the previous night, and our team has less than two days to save her.
Upon landing in Indiana, Hotch meets with the local cop in charge of the case, Captain Salters. Salters is upset that someone leaked details of the case to the media, thinking that the added attention will spook the UnSubs. He's right: in a bar across town, UnSubs Chris and Scott see news of their murders on the screen. Until that moment, they had believed that they had been "merely" abducting and raping the women, and that their leader, Michael, had drugged and released the girls without killing them. They confront Michael, and Scott tells him that he wants out. Michael tells them that the important thing now is to get rid of Stephanie and lay low for a while.
Meanwhile, Prentiss and Reid investigate the strip club while Rossi and Morgan check out the spot where the last body was found. The first group learns how the UnSubs select their victim, while the second group realizes that the pack releases their victim into the cornfield and let her think she's going to escape before the leader chases her down and kills her.
Their research confirms the profile: they're looking for three college students: an Alpha male who has murdered before (Michael), his loyal lieutenant (Chris), and a follower (Scott) who will soon break from the pack and be killed by the others. While our team tries to track down Scott before he is killed, they're too late: Michael convinces Chris to kill Scott in the middle of a cornfield that night.
At this point, Hotch and Rossi begin to suspect that someone inside the police department is working with Michael and Scott. Someone leaked the story to the media, and the killers seem to have perfect knowledge of police roadblocks. Hotch confronts Salters, and the truth comes out: Chris is Salters' son. Together, they race to catch the UnSubs before Stephanie is lost.
Michael and Chris are found holed up in their house, refusing to back down. The standoff is tense, and ends with Salters and Michael shooting each other. Salters is hit in the arm and survives, but Michael is killed. Chris is gunned down by the authorities moments later. Stephanie is finally safe, but all three members of the pack are killed.