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.
She was portrayed by Ruth Oliver.
In 1984, disturbances were being reported as coming from the New York City Public Library. More recently, a librarian, Alice, fainted due to the disturbances. It is revealed that the trouble is coming from a ghost. A team of three paranormal scientists (Ray Stantz, Peter Venkman, and Egon Spengler), are brought in to conduct an investigation. Based on eyewitness descriptions, Ray believed the entity to be a Free-Roaming, Vaporous, Full Torso Apparition. When the future Ghostbusters were about to act out Ray's plan to "get her", she changed into a terrifying form and scared them away. She was never seen or heard from again until 1991, though it doesn't mean that the Ghostbusters weren't trying to capture her again.
Ghostbusters: The Video Game
In 1991, due to the research of Winston Zeddemore it was revealed that she was the ghost of former Head Librarian of the New York Public Library, Dr. Eleanor Twitty. A new paranormal threat surfaces in New York, and en route to the Museum, the Ghostbusters heard of a ghost outbreak happening at the Library, and stopped to settle an old score. Ray, in particular, is still bitter about their first encounter, and hints that they may have had trouble capturing Eleanor's spirit throughout the years.
While scouting out the archives, Winston discovers information (via a stack of old newspaper clippings) providing insight into The Grey Lady's history and ghostly purpose. The clippings reveals her history and the events in her life which lead to her death (and becoming a ghost). According to the newspaper articles, Eleanor was seduced by a man named Edmund Hoover (also known as The Collector), who was a rather unscrupulous rare book collector. She was unaware that "The Collector" was just using her in order to get to the rare books in her care, including the Gozerian Codex. When she discovered her fiancee's true motives, she broke off the relationship and engagement. Sadly, dumping him all but sealed her fate and he murdered her in cold blood, in a secret section of the Library constructed by Gozer's infamous worshiper and architect, Ivo Shandor. Eleanor was the fifth woman to go missing under mysterious circumstances in 1924.
Winston relays this information while Ray, Egon, & the Rookie are chasing her (the information shocks Ray). During which they come accross the Gozerian Codex, which being used as bait as part of trap for the Ghostbusters, however they manage to overcome it an continue their pursuit of her. They eventually find Eleanor in a underground room at a desk quietly reading the codex. Surprisingly, she allows the Rookie to take it. Upon taking the book, she disappears, causing Ray to believe they had helped her pass on (Ray gives the impression that after learning about her tragic murder, he got over his bitterness towards her), however she suddenly reappears, changing into her "scary form".
She uses the Gozerian books scattered around to generate a energy shield. The team eventually 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. While Ray and Egon are pondering this revelation, a portal to an alternate dimension opens up in the room. Egon reveals the portal is a result of the energy produced from their battle with her, which causes the dimensional rip. They surmise that Eleanor did this to lead them to the one who murdered her, a man now known as a powerful ghost calling itself Azetlor the Destroyer.