The Creature Under the Castle.

I live in Baltmoree. A calm palace and a small town, we are known to be the biggest kingdom but really it is just the castle making it seem big by its huge size. I assumed that everything would go well after my father re-married someone until one night. I woke up to the loudest roar coming form under the castle. The whole place shook and everyone inside the castle even outside was shaken by the big vibration. I had to find out what it was, someone was hiding something and I think I might know who it is.