"Are you here for the gathering too?"  

Should he enter the underground river?

Where could he enter the underground river? Was this museum an entrance to the underground river?

After a moment of focused thought, he decided to search every room in the museum. The exhibits open to the public were only part of the collection; some items requiring special preservation or restoration were stored separately.

Searching for the museum had two purposes. One was to confirm if it contained any suspicious items like altars, totems, religious symbols, etc, that could indicate a Dark Realm passage. Two was to see if the human skin book was still here.