Brosh and Edward in “Unfinished Business”

I... I don't understand. These are cookbooks. What could they possibly have to do with alchemy?

Edward

Alchemy's a powerful art. It can be incredibly dangerous if misused. In order to prevent that, alchemic research is always encrypted. These are designed to look like recipes to the average person, but they're actually advanced alchemical notes. Only the alchemist who originally wrote them can understand.

If they're so heavily encrypted, then how are you going to be able to decipher them?

Edward

It's not going to be easy. We'll have to use all our alchemical knowledge.