Vivien and Violet get themselves caught in a dangerous situation. Meanwhile, Ben goes back to Boston to fix a mistake that he made.

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

Tate comes face to face with his past, and Ben and Vivien are haunted by a new houseguest before Halloween night comes to an end.

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

Violet learns about the rules of the house. The truth about Larry's condition is explained. Constance is interrogated by the police.