The main part that I remember is that the bad guys have Kaylee for some reason, and Jane recruits his 7(?) brothers to help him and the Serenity crew rescue her. A pair of hte "hands of blue" men are after them, and Jayne hears them questioning and then killing a guard around the corner before he shoots them. Jayne and Kaylee are in a relationship at this point, but the fic doesn't start out as it being established. It's multi-chaptered and fairly long.
Ring any bells? Any help would be much appreciated!