Looking for x-over between Sherlock and Tinker Tailor Soldier Spy

[cyeager]

I'm trying to locate a fic that was a crossover of sorts with Tinker Tailor Soldier Spy. It was backstory for Mycroft and its premise was that Mycroft was trained by George Smiley and Peter Guillam. It may have been part of a series but I'm not sure. Does this ring any bells?

Comments

[petite_hobbit]

I am not sure that it is the right one, but have you read:

http://archiveofourown.org/works/284554/chapters/453659

IT IS AMAZING!