From the Introduction
You are a house; you are haunted; and you just want to be left alone!
Why, when all you want is to be the sole occupant of your own body, do stupid humans insist on coming to stay in you, either because they are completely ignorant of what you are or because of it!?
You have a number of tricks and surprises at your command to help you evict those unwanted guests. Your power is strongest at night, while at dawn your power wanes. If you are up to the challenge you can have solitude, but if you fail you will have to suffer occupants until the next evening when your power returns and you can try again.