Head to the North toward the wall in front of you. There are rings in it that can let Arno climb up. You need to have the Lantern going to climb up the rungs as the bugs and other creatures will be blocking your way otherwise. Climb up the next ledge as well then the one on the right toward the back. Head over to the ledge you arrive at. Drop down then turn to the North, taking a moment to stop at the jar and refill the lantern.
This will lead you to another investigation zone. Use Eagle Vision to quickly learn the solution.
- Don't get into conflict
- Play organ (Distraction Opportunity)
- Let the allies do the job (Assistance Opportunity)
- Cover kills 0/2