By Paul B. Janeczko
A hands-on handbook that walks your child through making and breaking real codes and ciphers, plus writing in invisible ink.
A code-obsessed child could disappear into this for a whole afternoon. It walks through the real craft of secret messages: mixing invisible ink, hiding a note in plain sight, building and cracking classic ciphers like the Caesar shift and pigpen, and the tricks spies used to pass secrets in the field. Every method comes with step-by-step instructions, so your child can pick one and try it the same day, pencil in hand.
The appeal here is making things, not reading about them. A child who loves the idea of spies gets to build a working cipher, hand a friend a coded note, and watch them fail to crack it. That kind of payoff pulls in even a child who won't sit still with a novel. Janeczko keeps the instructions plain and the projects doable, and since it's a reference, it stays useful long after the first read.