The Fifth House
"You have been Sorted into Fosdyk House," Abel Fosdyk hissed. "Take the easy option. Join us." Tom didn't like the way the ghost stared into him, right into him. He didn't trust anything about this stranger and especially not his act of owning everything.
"I'd rather not, thanks. You see, I trust Professor Dumbledore much more that a ghost," Tom replied coolly.
"... Or, of course, there is the hard way," the ghost continued, smiling evilly into Tom's face.
"In short, come with me, we are going to the hidden house. The Fifth House. Fosdyk House."
Warning: This is not what you think it is.