Have a snooping sister? A barging-in brother? Five-fingered friends who can't keep their hands off your new Game Boy or their eyes off your diary? Then here's the book for you-a colorful, wise guy guide with all the lowdown on how to protect your special stuff from meddlers and nosy relatives: * Turn any place into a secret hideout * Make innocent-looking trick gadgets and trapdoors * Develop codes and maps with friends * and pass top-secret messages...