How could anyone possibly be as stubborn as William was right now?

The Final Problem, the Moriartys called it. The one act William had planned all along, at least, that's what Louis told Sherlock when he begged him to save his brother.

And Sherlock, being William's friend, of course agreed. The mathematics professor was one who followed through with plans, after all, and Sherlock wouldn't have that.

London was on fire, and the people were furious at William after the blonde had revealed his identity. They were actually wanting William to follow through with the final act of the plan.

"William, I didn't come here as a detective, but as a friend! Please, don't! If you stop now, we can still fix this!" Sherlock panted after having fought with William just a bit.

One thing about the lord of crime was that he was so damn, utterly stubborn. Too stubborn to actually comprehend what the detective was saying.

Originally, Sherlock hadn't known about the plan. However, even William's own people, who had known all along, now feared for the man's live. Louis, the lord's younger brother, especially. He had been so very upset when he had begged the detective to help.