In which Sherlock asks Mycroft for a favor.
This is an unusual fic in that it starts written in the first person, like Mycroft is recounting the whole tale to you in his own voice, but switches to third person after the first fic in the series. You get into Mycroft's brain quickly that way, then watch, one conversation at a time, as Lestrade puzzles him out as well. If you're looking for a dialogue-based slowburn riddled with lies and intrigue, this is the series for you.
Spot On - Lestrade is consistently clever and a darn good cop in his own right.