26 Pieces
By: Lanning
http://archiveofourown.org/works/244826?view_adult=trueSummary: Mycroft gives Sherlock the apparently simple task of solving a puzzle box containing a stolen microchip. It isn't simple.
A terrific long-ish Sherlock/John. Not only does it have excellent character development, it's got a good plot at the center with excellent action scenes. Featuring just a touch of BAMF!John. Captures just the right tone for both characters, including some very funny dialogue.