A documentary team comes to Button House to investigate a historical assassination plot.

Mike starts a new job, while Alison receives revelatory news from an unexpected visitor.

While Button House is treated for woodworm, Alison and Mike camp outside with the ghosts.

Alison invites Lucy over, but begins to doubt her after a troubling solicitor meeting.

Alison conducts a therapy session for Kitty that the other ghosts attempt to sabotage.

The ghosts work to solve a mystery that could have huge consequences for Mike and Alison.

Kitty thinks Santa has come early when a visitor is spotted in the grounds of the house.