The attention-grabbing American crime procedural spectacle has plenty of surprises up its sleeves. After going through a mini hiatus, Criminal Minds Season 12 Episode 4 has been rescheduled due to the anticipated presidential debate between Donald Trump and Hilary Clinton.

And after releasing an interesting promo for the next instalment, Criminal Minds has definitely hooked up its audiences. Titled as "Keeper" the approaching episode is full mystery and thrill elements.

Criminal Minds Season 12 Episode 4 spoilers hint that the serial killer is out on the loose. With never-ending killings in the Central City, the Behavioral Unit Analysis (BAU) head out to expose the main culprit behind the killings.

According to the speculation, the serial killer will be hunted for good, as the BAU team initiates their mission to reveal the trouble maker in the woods of Appalachian Train in Virginia.

In the promo released by Criminal Minds, the BAU team is hunting down the killer whose right arm is draped in blood and is apparently the only part of his body that is thoroughly visible. The killer is difficult to be recognized at the start, but after the efforts of tech savvy Penelope Garcia, the true face of the horrendous killer will be revealed.

Emily Prentiss has finally taken over the role of the team leader in Criminal Minds Season 12. She has replaced Aaron Hotch played by Thomas Gibson, who was fired from the series.

Criminal Minds Season 12 Episode 3 highlighted how Emily Prentiss is gradually getting a hold of her duties all over again. The BAU member turned Interpol agent Prentiss played by Paget Brewster is now back in the game to hunt down criminals in spine-chilling episodes.

Emily Prentiss, along with Luke Alvez will chase down the killer who has already killed seven people in the city. The approaching Criminal Minds Season 12 Episode 4 will therefore be the first journey of Emily Prentiss as part of the BAU lead team member.

Criminal Minds Season 12 Episode 4 airs on Wednesday, 26th October on CBS.