The Library Ghost (aka The Grey Lady, Gray Lady, Librarian Ghost) was the ghost of librarian Eleanor Twitty and the very first ghost that the Ghostbusters encountered. She appears to be a very odd reader as she likes to stack books up in the air. She was a minor character in the first movie and a major character of the Library level of the video game. A team of three paranormal scientists managed to destroy her shield and trap Eleanor, but then some realize that it was to easy to the point it seem to them that she wanted them to have it.
She was portrayed by Ruth Oliver.