S02E06: 'Mind The Bugs Don't Bite'

Alison has now completely given in to her mother's spirit. No longer having the strength to fight against it, she is re-enacting the same madness her mother experienced before her death and is on the verge of a complete breakdown.

Knowing that Alison hasn't seen her father since she was ten years old - the age she was when her mother died and when she began to see the spirits - Robert tracks down Alison's father, believing that he holds the key to understanding why she thinks her mother is coming back to haunt her.

During the course of one stormy night, Alison, her father and Robert come together under one roof to face the past. There, the secrets of Alison's childhood and the truth about how her mother died are finally revealed.

Extra! Creator Stephen Volk on this episode:
"Episode six is more about the main characters and their past and how things that are hidden in the past come up to haunt us in the present and eventually we have to deal with them."