Ghosts

The spectres try to think of a Christmas present for Alison

As Mike and Alison head off to celebrate Christmas with Mike's parents, the ghosts are touched to discover that Alison has left a gift for each of them in the library, with strict instructions not to open them until the couple return. Touched by her generosity, the spectres are inspired to give her a special Christmas present in return - but with Alison due back in a matter of hours, can they pull off their ambitious plan in time?