Sherlock Holmes & the Silver Cord

"I speak of magic, Mr. Holmes."
Poor Mr. Percy Simmons, leader of London's Theosophical Order of Odic Forces, stands upon the hearth rug of 221B Baker Street, slowly mangling his hat brim in ill-concealed distress and fully aware that his is not a case which Mr. Sherlock Holmes would ordinarily take up.
These are not ordinary times, however.
For something, some unquiet demon within Holmes stirs into discomfiting wakefulness under the occultist'swords. This unassuming Mr. Simmons has-in addition to his more fantastical of claims-spoken of good and evil with the sort of pure conviction and sincerity of soul that Sherlock yearns for. Something Holmes sought for himself during the three years in which the world thought him dead. While, for all intents, constructions, and purposes, he was dead.
But, six months ago, Sherlock Holmes gave up that chase. He returned to Baker Street, declared himself alive to friend and foe alike, took up his old rooms, his profession, and his partnership with Dr. J. Watson. Only to find himself haunted still by the questions which had followed him out of the dreadful chasm of Reichenbach Falls:
Why? Why had he survived when his enemy had not? To what end? And had there ever, truly, been such a thing as justice? Such a thing as good or evil?