The Final Problem
JIM: What’s the final problem? I did tell you … but did you listen?
Here it is:
MYCROFT: The damsel in distress. In the end, are you really so obvious? Because this was textbook: the promise of love, the pain of loss, the joy of redemption; then give him a puzzle … and watch him dance.
Irene is Jim’s trial run to burn Sherlock’s heart out. The real version uses John.