John gestured expressively to the piles of books in his office. "I already pulled most of the easily accessible ones in various demonic/infernal/celestial languages, so help yourselves," he said. "Only gotten through the three on my desk so far, so maybe the three of us will be able to go a bit faster."

He squinted at the slightly older Peter. "You got anything else to add, so we have a better idea of what we're looking for?"