The all-new episode of "Criminal Minds" Season 12 will feature an urban vampire as the main Unsub. The BAU team will investigate a serial killer who abducts and kills his victim by keeping them for several days.

In "Criminal Minds" Season 12 Episode 18 titled as 'Hell's Kitchen,' the focus of the team will be directed towards a so-called vampire based in New York. This killer comes with multiple personalities: Dr. Jekyll and Mr. Hyde and is a pro when it comes to kidnapping as he keeps his victims in the city's underground sewer system, TV Guide reported.

In the released promo of "Criminal Minds" Season 12 Episode 18, the BAU under the stewardship of Emily Prentiss heads out to scrutinize the suspected area. She even visits the underground sewer in order to have more insight regarding the case. Stephen Walker (Damon Gupta) accidentally steps on a dead body draped in blood, where the killer ultimately shows his face by saying "It's a good day, isn't it?"

While the BAU has their hands tied on the criminal cases, Dr. Spencer Reid is dwelling in his own predicament. There seems to be no way out for the formerly recognized and prudent officer and getting out of prison appears hard for him.

It is anticipated that Spencer's legal predicament will be wrapped in the Season 12 finale of "Criminal Minds". The official summary unveils that he will make a decision that will adversely impact not only himself but also his fellow prison mates.

Spencer tells an inmate that he enjoys a big social circle and can easily commit tasks. The innate, however, nullify his statement by saying that he's on the verge of losing it. That's where it strikes Spencer and he begins thinking about his future. He might be planning for a big prison escape.

While it seemed easy at the beginning, Dr. Spencer might be going on for a long time now. Previously, in "Criminal Minds" he lost his only friend in the prison, a man named Louis, making this, even more, intimidating for him.

CBS has released the final dates for "Criminal Minds" Season 12. The finale is slated to air on Wednesday, May 10 at 9 p.m. and is expected to feature the return of Shemar Moor as former profiler Derek Morgan, as previously reported by Deadline. Episode 18 will be broadcasted on Wednesday, March 29 at 9 p.m.