Floor 507 by MissAppropriation
A fic by MissAppropriation, filling in some of blanks of “The Doctor Falls”. Highly recommend!!!
Characters/relationships: Twelfth Doctor, the Master, Missy, Clara (mentioned only), gen. Doctor & Master friendship
Word Count/Chapters: 4498 so far, chapters 2/12 posted.
Summary: During their two weeks trapped on Floor 507, the Doctor asks the Master for help with a memory issue. Complete, 12 chapter Missing Scene for The Doctor Falls.
Warnings (quoted from author’s notes):
“-SPOILERS for all of 12's story, all of Missy's story and consider any Clara continuity fair game. These are not small spoilers, so if you are not up to date on any of this, I advise against reading.
“- I don't like Missy. (See tag above.) She seems to me to be a very different character from the Master and this fic contains an alternate explanation for her existence. Just FYI. I know Missy has fans, I'm not trying to upset anyone.”
So... If you’re attached to Missy, this may well not be the fic for you. However, if you want to see
12 and Simms interact more
An explanation for a bunch of the weird stuff in this ep/for Missy and the Master in general
A really good fic about 12 and the Master and their long twisty history
A really good fic about Clara’s importance to the Doctor, and how her arc is still affecting him
A really good fic, in general