The message was written in 'cipher'. [=the message was coded]
She was nothing more than a 'cipher'.
a 'cipher' that can't be decoded
(..) 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. (..)2010 TvShow: Sherlock Title: The Blind Banker Season: 1 Episode 2