I would write this myself, but my meds won’t let me, so I’m putting it out there as a challenge to anyone willing to undertake it.
I would like to see Mycroft lose his position (temporarily, of course, but that doesn’t need to become known until the end of the storyline,) and go back into ‘field work’ totally ‘unsanctioned’ by whoever his ‘bosses’ actually are, Sherlock, the ‘press’, etc. and do some damage against “the dragons” he refers to in HLV. Mummy & Daddy Holmes, Anthea, Lestrade (very covertly, without blowing his own cover as of the Met’s finest), possibly Donovan (I’m sorry, but I really, really want to redeem her character, possibly by making her a ‘Mycroft recruit’) and the ‘Other One’ could all be drafts in Mycroft’s ice storm that blows in on the east winds. Mrs H would be the ideal go-between (because, really, who suspects a sweet old lady with a dogy hip) keeping Sherlock and John from discovering what is going on until absolutely necessary, and possibly a J(anine) Moriarty, on the side of the angels, thrown in for good measure. As I am a Johnlock shipper, I am indifferent to Mary in this storyline, she can be there on either side, or not, but I want it done between her and John (the best thing ACD ever did was kill her off quickly).
I would prefer a plot and character driven storyline, minimal (but definitely some) porn, mature delivery with a lot of growing bromance, preslash Johnlock and a little (or even a little more than a little) Mystrade (developing or established) on the side.
Cameos by Bill Wiggins, Raz, Mr Chatergee, Lady Smallwood, Dimmock, Mrs Turner, Harry the equerry, Harry Watson, Molly and others would be welcome, but no Irene.
Baby Watson can make appearances, but only if not sappy and not too parentlock-y,