One Halloween night you received a letter..Why a letter and not a message to the phone? What are the old ways of communicating?

The letter contained an invitation to a mansion that was on the other side of town..You packed up and came there..

A huge mansion with about two floors. It's cold inside and smells of blood..It confuses you, but you enter and the door locks itself behind you, and after that a voice is heard:

"You decided to come to me, mortal.."