Valeri miraculously appears out of nowhere at the push of a button (or was it a pull of a handle). He is quite interested in studying runes, and rumor has it he was trapped inside a rune by a man with an insidious plan. Even if anyone believed such an absurd assumption was possible, who would have done it?
This is a hint that he's interested in the Raccoon Rune obtained from Flora at the Phoenix Inn during the quest Mind over Matter. Giving it to him completes the quest and awards the "Ego Raccoonis" achievement.