"That would be the question most of us would like the answer to," Castiel said as he grabbed for the book and pulled at it. It stuck in place, not coming out into his hand no matter how much strength he applied. The passage didn't open, of course, but the inability for the book to budge was definitely a clue. That must have been how this secret was found in the first place.

He turned back to Soushi. "The fact that it's so difficult to access is a clue in itself that there must be something of use there -- and many have guessed that Landel can be found therel."

Castiel wasn't expecting that they would find his office immediately, and there was frankly no guarantee that the Head Doctor spent all of his time in the institute, either. But there was only one way to know for certain.