Still an enjoyable series, although I thought it was too long, with a bit much of Arthur's side-trips. I was looking forward to learning more about the London Underground, and although there is some arcane bits tossed in, there could have been more about the "rails." (One of the better books in the series, The Water Room, had lots of interesting stuff about London's underground rivers.) I also found it too complicated and was disappointed in -- not so much the solution -- but what set things in motion that led to the killings. (Sorry, would have to include major spoilers to be clearer than that.)

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