The paintings of white lilies painted by a popular noble painter get damaged at Bath, a famous hot spring in England.  Feeling that he's seen the painting before, William goes to Bath, where he is reunited with Sherlock, who happened to be there to investigate the case.
If I had only forced him to rest when
I could have, then maybe Stanley--
Hätte ich ihn damals nur gezwungen,
sich zu schonen, hätte das Stanley,