Vengeance in the Castle

Once upon a time, there was a little girl named Lizabeth. She had a special ability, she could see ghosts. On day Lizabeth went to the tallest tower in her castle. Her father said that it was haunted by an evil spirit who wanted to kill all who ever wronged them.
Lizabeth knew what happened to the poor soul. Her great-great grandfather killed them after they were found cheating on the little girls great grandmother.
What happens when Lizabeth decides to meet this being to see if the stories are true?

A/N: First story, please forgive any poor writing!