First, explain how to crack the code, this is straight forward 1=A, 2=B and so forth as per the encryption key. Next, they practice by encrypting their own names (E.g. Name: Hana becomes Code Name:8-1-14-1). Give them some time to decode, once they are done ask them where Bond is, this should be easy as it is the only odd word in the puzzle.
I included an answer key to save you the trouble and time.
Enjoy!