A ghost story

My fathers bought a strange mansion in Ireland and one day I saw a boy's shadow!

I was in my bedroom when the shadow appeared. First I saw a shadow next to the door. It was moving. Then, the boy's shadow disappeared. Next day the shadow returned and I saw the ghost of the boy! He didn't speak, but the boy looked at me.
Next week I searched for information. Many years ago, an unfriendly family lived in the house. The daughter died because an evil thief went to her house and he killed the boy. Now I usually see the shadow, but I'm not frightened. I know that he is sad.