Mischief Indeed Clue No.1

The code word is written with a blacklight pen on the back on one of the stacks. Use the blacklight flashlight from the Information Desk to see it. The word is coded in Caesar Code https://brilliant.org/wiki/caesar-cipher/ with a shift of two. You can borrow the TOP SECRET book at the Information Desk if you need more help. Decode the word and then write it down in a safe place!