(..) His notebook. You stole it? I borrowed it for tonight. I thought you could translate some of it... I can't. No one can. It's a cipher. Even with the keyword, it will take months to decode. - And without the keyword? - Perhaps never. - We'll see. (..)

(..) God, I miss New York, though. - Why are you here? - The lightning lives here. And not much else. Our work is secret. That a cipher? A rotating transposition that shifts every day of the diary. Simple but time-consuming to translate, even with the five-letter keyword. Which is? (..)

(..) what connects these two men. Date stamped on the book is the same day that he died. Sherlock? So, the killer goes to the bank, leaves a threatening cipher at the bank. Van Coon panics, returns to his apartment, locks himself in. Hours later, he dies. The killer finds Lukis at the library, he writes the cipher on the shelf where he knows it'll be seen. Lukis goes home. Late that night, he dies too. Why did they die, Sherlock? Only the cipher can tell us. (..)