Webster: Moving On (1984)

Originally aired 2 November 1984, this episode feels a little like a Halloween episode, even though no mention is made of the holiday. What you get is a large, Victorian house with secret passageways and a particular room that is always kept locked. Katherine and George are looking for a place to rent, and Katherine especially thinks that this house is the one for them. However, George wants to know what he is paying for and wonders why the owners don't want them going upstairs. While George and Katherine are going over details with the owners, Webster is off on his own, discovering a way to enter the locked room.

Here is a clip from the episode: