
Once you emerge, destroy Joker teeth #6 on the left and go to the right to acquire the Line Launcher. Scan the panel near the ceiling and throw a batarang to reveal a vent which you must follow. Grapple up a few times until you reach an electrified platform. Go through the door and scan the ceiling to then open it with a batarang. Next, drop down and beat up all the thugs. Now, as gas is filling the room, quickly grapple up to the upper level to the right of the spiked bookcase and scan the Personal Journal clue (part of the "Doctor's Orders" detective case), then drop down and grapple up to go in the open vent on the other side of the spiked bookcase.Īfter you emerge from the long vent section with electrcity and gas and you see several thugs gathered in a circle talking to each other, remove the vent cover in front of you and enter, to reach a room where you can scan the Cylinder Cap clue (thus completing the "No Laughing Matter" detective case). If you still have one thug left, lure him once again and silently take him out. When they gather around the body of the thug, drop the chandelier on them. Lure the remaining thugs over to the body by hitting the garbage can on the upper level with a batarang. Scan the garbage cans, as well as the chandelier. Immediately silently takedown the thug right in front of you, then retreat to the vantage points. Then, go in the vent in the room where the hostages were, and emerge in the library, where two librarians are again being held hostage by 4 armed thugs. Grapple up, and go in the vent to eventually emerge from a grate to silently takedown both armed thugs and rescue the hostages. Next, follow the path to the right, and go into the next room with two librarians being held hostage by two armed thugs.
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After emerging and fighting off several thugs, go to the left and scan the Ventilation manual clue (part of the "No Laughing Matter" detective case) found on a mattress. From here, scan the Glass eye clue (part of the "Kidnapped" detective case) and go through the vent. Head through the vent and move the bookcase once you emerge.

Next, grapple up twice and once again scan and destroy the debris to the side. Head up, through the doors after Joker traps you in a room with gas, and defeat the thug. When you respawn, in the burning room, scan the debris at the top, then destroy it with a batarang.
