Robert Downey Jr., who stars in the new movie  Sherlock Holmes: A Game of Shadows, is the latest actor to take on this iconic role. Guy Ritchie, the film's director, says Holmes' persona is an even divide between enigma and accessibility. WNYC's Sarah Montague traces the character's evolution and reveals how Holmes keeps changing to suit the times. (Originally aired: December 25, 2009)

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