Aired 8 years ago - May 16, 2013
As Sherlock reels at the reappearance of his former lover, Irene Adler, a series of flashbacks unravel the tumultuous events that led to his downfall into addiction. Sherlock and Joan once again find themselves in the crosshairs of the enigmatic Moriarty.
Mouse over thumbnail for slideshow
Or scroll and see one by one: