Haunted House Time

In the next session I want to send my party to a haunted house. This is a really good opportunity to put into practice my resolution of piling on more atmospheric description (see last weeks post)

What I was hoping is that I could ask the readers here for more tips and your experiences of running a haunted house session. I am planning on the final showdown to be a zombies attacking from the grounds, breaking in through the doors, windows etc and slowly forcing the party up the stairs to the top of the house.