Nothing is known about the origins of Mercy MacGregor. But according to a portrait, she was the head Librarian from 1895 until 1910. She might have been the library’s first Librarian. During her tenure as the Librarian, she was a very strict and serious librarian who put up with no nonsense and no noise. She kicked out disruptive children or sent them to the basement to read inside the quiet reading room. Her basic belief was that Silence is Golden.
In the year 1910, she died. When she died, she turned into an insane and vengeful spirit haunting the library to ensure that it would remain quiet. Also she was granted a magical containment box, which she could use at her will to capture as many sounds or voices as she desired. She turned The Quiet Reading Room into a prison to capture noisy people and their spirits.
When a person (usually a child) made noise near The Quiet Reading Room, she would open the door and approach them. Then she would use her magical containment box to steal their voice and trap them inside The Quiet Reading Room for as long as she wanted.
Then for many years, she wasn’t there. This happened because the door of The Quiet Reading Room needs to be visible for her powers to work and overtime the basement got more bookcases and carts and the door was barricaded and no longer visible.
Then one day in 1994, a young boy named Timmy came down to the basement to retrieve his small green bouncy ball. He moved a cart out of the way and the door was now in clear view again which activated her powers. She opened the door, stole Timmy's voice and trapped him as her prisoner in the room. Then soon, she trapped a girl named Natalie into the room, after her little sister was singing the alphabet song.
During nighttime, she would have the entire library look like it’s in a time loop back to the year 1910. When this would happen, everything modern would disappear from the library and the library would appear to how it looked in 1910. Then one night, she could sense children wanting to break into the library so she unlocked an upstairs window for them.
The children were Laurie Napier and Jace Ellman. They decided to break into the library to retrieve her notebook to be able to finish their history assignment together. She soon encountered them, believing them to be making noise. She stole Laurie and Jace's voices and tried to trap them into the reading room with her other prisoners.
Then soon Laurie and Jace kept playing with a sound effects toy that made loud and irritating horn and siren sounds. This irritated her beyond belief as she struggled to capture so many sounds. Then eventually her magical containment box overloaded and broke down and all the spirits were released. When this happened, she lost her powers and she was destroyed, turning into dust. Then the library was peaceful and the children never had to endure her wrath ever again.