Haunted Room?

The whole incident with Catherine in the window of the guest room where Lockwood passes the night is very unexpected and somewhat scary. The first couple chapters seem very realistic and normal when all of a sudden, there is an appearance of a specter. It happens like this: Lockwood is awoken by the noise a tree is making, scratching against the window of his room and so he decides to fix the problem and reaches out of the window. When he does this, a cold hand grasps his and there is a waif called Catherine who is sobbing for him to let her in. This occurrence is rather unnerving and I would have passed it for one of the nightmares Lockwood had that night had it not been for the fact that Heathcliff continued to ask the specter to return, as if she has made appearances before.  SPOOKY!