Robert Downey, Jr.’s Holmes is dangerous-crazy-cool, Jude Law’s smart Watson is his match, the pre-Moriarty bad guy is as bad as they come, and London is their giant, grimy, clanking, dripping, bustling chessboard.  The action (there’s plenty of it) plays around with time to take you into Holmes’ white-hot brain as he maps out a bare-knuckle boxing victory or staggers against the tidal wave of sensory data at a crowded restaurant.  Backed by those lowering skies and muddy streets, colors really explode — Irene Adler’s (Rachel McAdams) scarlet satin; gleaming metal gadgetry; …actual explosions.  This movie is fast, hot, edgy, and tight, with an intriguing score.  Highly recommended!