HOW TO KEEP A SECRET
By
Subtitled Writing and Talking in Code, this easy introduction steers readers once more through the standard code and cipher formulas. . . from Pig Latin through transposed letters, number substitutes, grids, and original symbols. . . fading out on cue with varieties of invisible writing. It also makes much of decoding keys and devices and how to protect them from enemy spies, and hides a running ""Fortune Cookie"" mini-mystery in the coded examples, deciphered (for the very lazy) in an appendix. Nothing new, nothing to stump an enemy spy with any of a number of existing handbooks, but briskly presented.