Once this game is afoot, it seems too large to be contained by the eccentric investigator of 221B Baker Street and Watson, his intimate. (I am using "intimate" as both a noun and an insinuation.) It's more of a case for James Bond, and Moriarty's grandiosity seems on a scale with a Bond villain. Guy Ritchie and his writers Michele and Kieran Mulroney, however, wisely devote some of their best scenes to one-on-ones between Holmes and Moriarty.

Their struggle comes to a head in an elegant, high-stakes chess game, held for some reason in Switzerland in the dead of a winter night on a snowy outdoor balcony. As played by Jared Harris, Moriarty doesn't gnash or fulminate, but fences with Holmes in barbed language. This returns the story somewhat to the Conan Doyle tradition that Holmes did most of his best work in his mind.

Dr. Watson has a more proactive role this time. "A Game of Shadows" opens with him recalling these events on a typewriter that is too modern for 1895 but maybe suggests he's writing years later. He's not just a confidante and chronicler but a hero, too, involved in fights and shootouts. His wife must be thankful that Holmes abruptly eliminated her from most of the action.

Mycroft, Holmes' brother, turns out to be well-placed at the center of European diplomacy; Stephen Fry has plummy good fun in the role, especially in nude moments where he shields his netherlands from view by employing artfully arranged foregrounds in the "Austin Powers" tradition. Two women characters are prominent. Back again is Irene Adler (Rachel McAdams), the enigmatic figure in much romantic speculation about Holmes. And we meet for the first time a gypsy fortune teller named Madame Simza Heron, played by Noomi Rapace, the original "Girl With the Dragon Tattoo." She capably discharges the duties required of her as Madam Heron, but demonstrates how really brilliantly conceived the Dragon Lady was. Heron is pale by comparison.

It's Downey's movie. With his cool, flippant manner, his Holmes stands apart from the danger, thinking it through visually before performing it, remaining insouciant in the face of calamity. He appears in many disguises, one with a markedly bad wig, another as a remarkably convincing chair. The thing to do, I suppose, is to set aside your memories of the Conan Doyle stories, save them to savor on a night this winter and enjoy this movie as a high-caliber entertainment.

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