I... wow. This was incredible. Enigmatic at first, then revealing itself bit by bit, and constructing the characters one step at a time from a shadowy background. I love how Helen has an almost Victorian diction that recalls ACD!Watson, and that she is also called "Watson" and calls Sherlock "Holmes" - it's a lovely throwback to earlier times, and it mixes the generations together in a way that's very fitting for a ghostly story. The brief snapshots of past tragedy - John's death, Mary's breakdown, Sherlock's guilt - leave me wanting to know more, but already paint a compelling picture on their own.

Honestly, I sped through this breathlessly. Amazing work, mystery author.