Serial killer enthusiasts reenact the brutal murders of two nursing students, while Ben returns to Boston to fix a mistake involving an old flame. Vivian and Violet get into a situation eerily similar to past events.
After putting the house back on the market, Vivien learns about its first residents. Elsewhere, Ben's visitor causes him to further unravel, and Constance and Moira's history is revealed. Murder House has a long history of murders.
Halloween night concludes with Tate coming face to face with his past. While on a date with Violet, Tate is harassed by a group of bloody teens. Ben and Vivien are haunted by one of the house's newest guests.
Constance enlists Violet's assistance with Tate. Ben sees a new patient who is terrified by the legend of a man who slaughters those who repeat a specific mantra into a mirror. Ben helps a new patient confront his fears.
In 1994, Larry gets burned. In the present, Ben begins to understand what happened to cause Vivien's institutionalization. Constance is questioned by the police in Travis' death. Violet learns something about herself that she doesn't know.
The aftermath of Vivien's difficult labor is revealed and Ben makes plans to get out of the house. Some of the spirits have other plans and the family has to pull together to make it through these very tough changes.
