Think of the author involved here, and the opening of one his novels that involves London and Paris - two cities.
I did think of deadlight but my dictionary says it only exists in the plural. I got sidetracked thinking of the dog called Bullseye, which does tie in with the theme.
I'm just stuck on 27d - K ? R ? E ? L . "one among kings to distinguish German corner." Kirtell or Kartell fits but I can't find any meaning to those words.