Ultimate Spy Vault & Code Kit

Build a spy vault to hide your most prized possessions
from meddlers and enemy agents with the ULTIMATE SPY VAULT &
CODE KIT.
Customise the combination for ultimate security, then build your
own door or pressure plate alarm to scare off any intruder! You'll
also learn all about the science of making and breaking
codes, secret messages, finger-printing and how to construct your
own diversion safe to protect your room from prying eyes!