8th floor ghost?

"I was working late until 6.30 earlier this year and had to fetch from the Stack. One of the items on my list was on the 8th floor. I approached the relevant section; suddenly I felt the temperature drop and I began to feel uneasy. I thought maybe I was imagining it, but when I looked up the book I saw that the book in question was about ghost stories. I decided to take the book and leave as quickly as possible. As I was leaving, I glanced through the lift door and noticed that a light had come on near to the section where I had been. The lights are motion sensitive and there had been no one else up there. I told a colleague about this at a later date and we tried to find the book on the catalogue but had no success."