I'm going to interrupt the flow of this narrative for a moment to point out that our Sherlock Holmes is played by Jonny Lee Miller. In 1995, Mr. Miller appeared in a movie called Hackers, which I like very much and I don't care if hackers don't really look like Jonny Lee Miller and Angelina Jolie. I also don't care if hackers don't really wear rubber and go rollerblading everywhere. My point is this: Jonny Lee Miller was in a movie in which he subjected someone (Wendell Pierce, who played Bunk on The Wire) to a life-ruin. And now karma has come around and he is receiving the same treatment. That's all. I'll get back to the show now.
Holmes asks if Watson's passwords are based on the names of family members. Then they leave the brownstone, because all the phones are ringing. At the police station, they learn that their phones have been disconnected already. Holmes asks Bell for permission to examine the box, because it might have clues to where Kleinfelter had been hiding. And he might have gone back there.
Holmes studies the box of crackers. They're stale, which makes it weird that they're among Kleinfelter's most prized possessions. Holmes checks the box itself, which is labeled "OCD." The Office of Civil Defense, which maintains emergency bunkers. There are a lot of them. Holmes's phone has no signal, and he needs to make a visit.
Holmes and Watson go to a giant building, which is occupied by Milton Van Kirk, who has spent his entire life on a biography of Robert Moses, an important New York architect. He's an expert on New York geography, so he should know where all the emergency bunkers are. Inside (in a great room) he reports that there were 41 bunkers, but they were all decommissioned. Holmes takes a look at Van Kirk's notes, leaving Watson with him. Holmes has found one bunker in the Brooklyn Bridge that was never decommissioned. And Kleinfelter had access to government records, so he could have known that as well. Success! But before they leave, Van Kirk has Watson take his 5,000-page manuscript so she can read it for him. Holmes points out that this will help her avoid wasting time on the Internet. Holmes's phone is dead, so he asks a bike cop to take a message to Gregson: "Kleinfelter hiding. Brooklyn Bride. East Caisson. On the way." He's a little smug at Watson about how a discreet digital footprint reduces harassment. And then the Secret Service roars up, because a blog called "44mustdie.com" has been traced to Holmes's IP address, and it's chock-full of plans to assassinate the President. This is just the sort of thing he did to Wendell Pierce!