Ce trebuie să știi

"for anyone who wants to be a good spy, this is the book for you. It reveals all the tricks and skills you will need: how to follow enemy spies without them knowing, how to write secret messages and hoe to disguise your self at the drop of a hat. This book should be kept near you at all times, so you can check your codes and essages - and keep your secrets out of the hands of the enemy" (publisher).