"Criminal Minds" season 12 resumes on Wednesday, Oct. 26 with episode 4 after a week-long break. Episode 4's title, "Keeper," seems to suggest that the serial killer will finally be known. Bloody and at bay, the serial killer's identity will surprise everyone. Who is his/her "keeper"?

BAU In Hot Pursuit Against The Serial Killer

"Criminal Minds" season 12, episode 4 spoilers tease that the serial killer might be finally revealed. After the string of killings in Central City with no known suspects, the Behavioral Analysis Unit (BAU) decides to set out on a hot pursuit against a person of interest. The team, led by Emily Prentiss (Paget Brewster), heads out to a manhunt operation in the Appalachian Trail in the outskirts of Virginia.

Who Is The Serial Killer?

A ton of rumors and speculations have been sprouting around the web as to who really is the serial killer. While there's not even a single hint leading to a person's identity, different versions of reports have surfaced. In the video teaser for episode 4 released by CBS, the team is chasing down the monstrous killer whose right arm covered with coagulating blood is the only part of his/her body seen. When the suspect is revealed, it is speculated that he/she will be beyond recognition at first sight. And, it is the findings of Penelope Garcia (Kirsten Vangness) that will truly shake American TV on Wednesday. Is the serial killer a human?

Tracking Down Serial Killer: Prentiss's First Feat

Despite knowing the dangers of the area, spoilers suggest that BAU will be able to capture the suspect and this will be Prentiss's first achievement on board. According to previous reports, Prentiss's leadership will be showcased to cover what Aaron "Hotch" Hotchner (Thomas Gibson) left with the team.

"Criminal Minds" season 12, episode 4 airs on Wednesday, Oct. 26 at 9 p.m. ET on CBS.