The Three Investigators' Secret Safe

All budding detectives need a safe place to store important evidence or secret messages. This small safe protects all secrets, even when you're on the go. Only those in the know know how to crack the secret safe. Because only a special trick can open the secret compartment inside and reveal the hidden treasures...

Everyone else is denied access – if you want to get to the contents, you'll have to puzzle out the opening mechanism!