Serial killer enthusiasts reenact the brutal murders of two nursing students, while Ben returns to Boston to fix a mistake involving an old flame.

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.

The line between the living and the dead blurs on Halloween as two of the house's previous residents give the Harmons decorating advice.

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.

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.

Moira persuades a prospective buyer to make an offer. Constance and Larry work against her efforts.

The man in the rubber suit is revealed. Vivian's mental health takes a turn.

One of history's most famous murder victims pays the house a visit. Constance discovers more of Tate's bad behavior.

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.

Vivien gives birth. Violet learns who fathered one of her new siblings.

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.