This is a more fleshed out version of Holmes's 1890 reunion with Helen Stoner. I decided that I indeed wanted her to wait to accept his proposal. It's around summertime, after the publication of SIGN in February 1890.
This is the year that Watson moves his practice from Paddington to Kensington, and Holmes thinks that Watson is trying to avoid him. He decides to try to move on by apologizing to Helen for what happened in Chapter 8. Again, the chapter numbers are based on the DIM outline as it stands now.