It's the first time Mike has been left alone with the ghosts in the house at night -and he's nervous.

However, he assures Alison that she deserves to have a night out and let her hair down. And they're only dead people, what could go wrong?

As Alison leaves for the night, Mike settles in and the ghosts happily pass the time with music club, but they're soon interrupted by some uninvited guests. When their attempts to call the police fail miserably, it becomes the ghosts' mission to try to alert Mike and figure out how to protect the house from the intruders.

Meanwhile Alison has her night cut short and is forced to go on a treacherous cross-country journey back to the house, discovering the kindness - and sometimes lack thereof - of strangers.

Lady Button discovers her inner criminal mastermind, Julian works his talents harder than ever before and Robin enlists help from the unlikeliest of places.