Sherlock (Benedict Cumberbatch) must solve perplexing and dangerous puzzles specifically laid out for him. Can he and Watson (Martin Freeman) catch up to the villain before innocent people are harmed?
Watch Sunday, January 29, 2012 at 9pm.
Get a sneak peek at Sherlock Season 2: A Scandal in Belgravia that premieres May 6, 2012:
Watch Sherlock Season 2: A Scene from Ep. 1 on PBS. See more from Masterpiece.
