Librarian solves mystery on why so many “wee old woman books” have page number 7 crossed out

Some quality sleuthing on a book mystery here – why do so many “wee old woman books” have page number 7 crossed out?

So there was a MYSTERY at the library today.

A wee old women came in and said "I've a question. Why does page 7 in all the books I take out have the 7 underlined in pen? It seems odd."
"What?" I say, thinking she might be a bit off her rocker. She showed me, and they did.

— Georgia | Saoirse (@green_grainger) April 3, 2018

I asked if she was doing it, she said she wasnt and showed me the new book she was getting out that she hadnt even had yet. It also had the 7 underlined! "I don't know, maybe someone really likes page 7?" I said, assuming of course that there is a serial killer in the library.

— Georgia | Saoirse (@green_grainger) April 3, 2018

I checked some other books. Most didn't have it, but a lot in this genre did – they're "wee old women" books (romances set in wartime Britain etc). Lots of underlined 7s. The woman who pointed it out shrugged and went on her way, "just thought you should know".

— Georgia | Saoirse (@green_grainger) April 3, 2018

My manager came back from doing arts and crafts with some of the kids and I decide to tell her about the serial killer in the library.

And that’s how I found out that a lot of our elderly clientele have secret codes to mark which books they’ve read before.

— Georgia | Saoirse (@green_grainger) April 3, 2018

Our computers do it automatically but many have been doing it since before that was possible, so Esther might underline page 7, while Anne might draw a little star on the last page, and Fred might put an “f” on the title page. Then when they pick it up, they can check!

— Georgia | Saoirse (@green_grainger) April 3, 2018

It’s quite clever really but now I’m dying to just underline page 7 of every new wee old women book we get in.

— Georgia | Saoirse (@green_grainger) April 3, 2018

So, good news: there’s not a serial killer in the library whose MO include the number 7 and wartime romances. Bad news: people are defacing books rather than just asking us to scan them 😡

— Georgia | Saoirse (@green_grainger) April 3, 2018

I'm now concerned that the amount of people enjoying this thread means there's going to be a new spate of readers using secret codes – apologies to librarians everywhere!

(although, in truth, I find it hard to be annoyed about it – better than torn pages and felt pen graffiti!)

— Georgia | Saoirse (@green_grainger) April 4, 2018

(Also, I am new to the library job, hence why I hadn't seen it before! The library and our customers are great though 😊)

— Georgia | Saoirse (@green_grainger) April 4, 2018

Just had another victim of the page 7 vandal returned!!!
(Now checking every book that looks like it might be their taste…) pic.twitter.com/SGHST4kcOv

— Georgia | Saoirse (@green_grainger) April 4, 2018