'Criminal Minds' season 12 episode 4 spoilers: Halloween is in the air as BAU scours the woods for serial killer

(Facebook/CriminalMinds)Promotional image for the CBS police procedural "Criminal Minds"

The Behavioral Analysis Unit (BAU) will have quite the Halloween experience in the next episode of "Criminal Minds" season 12, which is titled "Keeper."

In this installment, which will be the season's fourth, the BAU will go after a serial killer who lives in the woods. The promo for the episode teases that this criminal is unlike any other.

Looking at the "Criminal Minds" season 12 episode 4 clip, it appeared as though the murderer had sharp claws, which, for a moment, will have viewers thinking that the BAU is dealing with something supernatural.

The search for the killer will take place along the Appalachian Trail in rural Virginia. A lot of members of the team are present, but it looks like he somehow outruns them.

Additionally, as the group continues to look for information about him in "Criminal Minds" season 12 episode 4, things start to get more hair-raising than ever before.

Leading the charge in the investigation is Emily Prentiss (Paget Brewster), who replaces Hotch (Thomas Gibson), who was written off in the previous episode.

Gibson was fired prior to the airing of "Criminal Minds" season 12 after a physical altercation with a producer from the show. Brewster was supposed to be brought in for several episodes only.

The actress recently spoke to CBS News to explain what her character has been doing when she was not working with the BAU, and it appears she has been quite a busy bee herself.

"She's been running Interpol for four years, and now it's just really nice to be back on the team full-time," Brewster said. "So far, they've made [Prentiss] powerful and good at the job and invested," she added.

Indeed, this will be the case in "Criminal Minds" season 12 episode 4, where she spearheads the arrest of the mysterious serial killer all while making sure he claims no more victim.

"Criminal Minds" season 12 episode 4, "Keeper," is scheduled to air on Wednesday, Oct. 26, at 9 p.m. EDT on CBS.

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