You've just learned important information that must be sent up the chain of command to the head of your unit. But you are in enemy territory, and every move you make is watched. It's a good thing you have the Thames & Kosmos Spy Labs Secret Message Tools. With the invisible ink pen, you can write your message on an old grocery list, and no one will be the wiser. Your boss can use the second pen to reveal the message. Once again, humankind is saved.