- Sam and Dean meet up with America's first serial killer, while Jo lies to her mother about going to Vegas and joins Sam and Dean to help them on their hunt.
- Ellen's daughter Jo proves to the Winchester brothers Ash taught her well to research a case file, notably on a Philadelphia apartment building where young blond female residents disappear since about 80 years, but after so many years the police never considered a serial killing. Dean reluctantly takes the case which seems genuine when Sam finds ectoplasm, but even covers for Jo when she follows them and quickly rents the room of the latest victim, understands when he finds she's hell-bent on 'hunting', even serving as bait, because it's her way to feel closer to her late dad, who once was a partner of pa Winchester. Ellen shows them the building is next to a former prison, the list of executed murderers includes the real name of H.H. Holmes, the first-ever American to be dubbed a serial (at the time 'multiple') killer. After searches for hidden rooms, like in Holmes' Chicago 'hell house' which had traps as well as dungeons for his sadistic slow murders, Sam figures out after Jo has been taken herself there last chance is a subterranean sewage system. While Ellen catches up and announces furiously to be on the next flight, the boys desperately look for the girls to capture the ghost between salt, but Holmes puts up a good fight...—KGF Vissers
- Sam and Dean investigate the brutal killings of blond women from an apartment building and discover with Jo who, defying her mother Ellen's wishes, follows the Winchesters on their hunt that the demon responsible is the ghost of the first serial murderer, H. H. Holmes. Ellen is captured by the ghost and buried alive.—Drifa Baljet
- Dean and Sam visit Ellen and Joanna Beth in the Harvelle Bar, and Jo shows her file about the disappearance of six blonde girls during the last eighty years in an apartment building in Philadelphia, Pennsylvania. She tries to convince the Winchester brothers to bring her to investigate the case; but Dean refuses the request afraid of Ellen's reaction. They break-in the apartment of the last victim and when Sam finds ectoplasm, they realize that a fiend is hunting the location. When they leave the place, they meet Jo with the super and find that she had lied to Ellen telling that she was going to Las Vegas and had just rented the foregoing apartment. Their further investigation discloses that in the past, before the construction of the building, the field was next to a prison and used to execute criminals, including the serial killer H.H. Holmes. When Jo decides to search the last victim behind the walls, she is captured by the evil spirit, and Dean and Sam figures out how to rescue Jo and escape from the wrath of Ellen.—Claudio Carvalho, Rio de Janeiro, Brazil
- The boys arrive at Harvelle's Roadhouse to find Ellen and Jo in a heated argument. Jo has discovered a potential case in Philadelphia, and Ellen refuses to let her leave the Roadhouse to become a hunter. Jo gives the case to the Winchesters, in which blonde girls in an apartment building are disappearing. The boys discover ectoplasm in the apartment of the latest victim, a sign of strong supernatural manifestation. As they search the building they run into Jo who has followed them from the Roadhouse. Jo explains that Ash has laid a false trail so that Ellen won't know where she is.
With Sam covering part of the building, Jo and Dean scan the other part with EMF meters looking for supernatural activity. They argue as Dean criticizes her for pursuing hunting when she has other options in her life. Jo's EMF meter starts registering activity, and within a wall vent they find a clump of hair from one of the victims. Unknown to them, at the same time another woman is abducted.
The next morning, while researching the case, Jo shares with Dean that the reason she hunts is because it makes her feel connected to her father. They discover that the apartment building was erected over the place Dr. H.H. Holmes, America's first serial killer, was executed and that he may be holding his latest victim in a hidden room.
While searching for the hidden room, Jo is captured by the spirit of H.H. Holmes. As Sam and Dean try to work out where Jo is being held, Ellen calls, having worked out that Jo is in Philadelphia with them. Dean confesses to her that Jo has been kidnapped and she declares she is catching the first plane there.
Sam works out that the spirit may be holding his victims in an old sewer system beneath the apartment building. Jo is indeed being held there, along with the previous victim Teresa. She manages to hold to spirit at bay with her father's iron blade until Sam and Dean discover an entrance and rescue them both. In order to trap the spirit, Jo acts as bait to draw him out. When Dr. H.H. Holmes reappears, a contraption releases salt to line the perimeter of the underground chamber, trapping him inside it. As an added precaution, Dean uses cement to seal the chamber, and H.H. Holmes in it.
Ellen catches up with the boys and Jo, and there is a long uncomfortable drive back to the Roadhouse. Angry at the danger the boys put Jo in, Ellen reveals to Jo that her father was killed while on a hunt with John Winchester.
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