At the First Edition, in the Imperial City Market District, you will find a book named "Diary of a dead man". It tells the horror a rich manor owner has lived. Unfortunately, the story remains blurred and you will have to investigate the manor to find out what really happenned. Beware! Once you enter the haunted house, terrible things will happen to you. You will discover the existence of a secret guild and... Well, I can't tell you more... You will have to discover it by yourself.
This is the full version of Haunted House v1.5. Make sure you read the Readme before installing it. It requires the Shivering Isles expansion pack to work. Otherwise, the game will crash at launch.