is what I'm reading now. And I have to post my thoughts here because I don't know very many people (on Facebook, such as) who have the knowledge of both the book and of London tube stations to understand my thoughts.
So in the book right now, they're looking for an angel named Islington. And they decided to start searching at Bank.
"They should start searching at Angel," I thought, "since they're looking for an angel."
My thoughts continued, "But then again, if they're in Central London, I suppose they can't start at Angel. Angel is in Islington...
"Oh. I get it."