Arkham Mansion--Part 3
Investigate Dr. Young's Office
Proceed through the Northern Corridor, up the stairs, then into the vent by the locked door. It leads into a cell-block; look for a vent high-up on the western wall that you can grapple inside. It leads to a grate-covered floor, where you'll find another vent on the left that can be entered.
Riddler Trophy
After grappling to the vent in the cell-block and emerging on the grated floor, check the southwest corner for a trophy.
The vent exits into a room overlooking three inmates below--dive bomb the center one and perform a quick ground-takedown before taking on the other two. Afterward, head up the stairs and use the Batclaw to rip open a vent in the left wall and grapple inside. Kick out the vent covering the other side to drop into Dr. Young's office.
Isolate a Forensic Trail for Dr. Young
Use Detective Mode to scan the safe embedded in the northern wall to isolate the forensic trial.
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