Death Takes A Holiday: In The Shadow of the Black Mountain

After his Fall, the ghost of Sherlock Holmes and the ghost of The Woman once known as Irene Adler encounter each other in the Montenegrin city of Kotor, and a very simple offer is proposed:

"Be Irene Adler. Destroy Jim Moriarty's legacy with me."

But can two individuals as extraordinary as the two of them remain undetected ghosts, and more importantly, would they want to?