Alison’s attempt to win over their posh new neighbours with a swanky dinner party are thrown into chaos by Mary’s woeful catering and Robin’s desire to celebrate the lunar eclipse.

It’s a nervous Mike’s first night alone in the house when some uninvited guests set the ghosts on a mission to defend their treasured home.

When a documentary team comes to Button House to investigate a historical assassination plot, Alison and the ghosts are shocked to discover that it involved one of their own.

Alison and Mike invite Barclay to discuss the land sale but are quickly forced to play hardball. Meanwhile, the ghosts become fixated on solving the mystery of Kitty’s death.

Robin has a revelation that unnerves the ghosts and prompts them to consider their legacies. Alison and Mike decide to have a spontaneous wild night out.