Secret Scarecrow Lair
To find a secret lair in Arkham City, climb to the top of the boat in the industrial district, by two cranes.
Once there, use the Cryptographic Sequencer and manipulate the letters until the message "City Of Terror" is displayed.
A secret path will appear on the boat, allowing you to climb down into a infested hull. You can pick up a medical form for Jonathan Crane and see a scarecrow that reacts when you zoom in on him.
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