The Cryptogram Challenge: Over 150 Codes to Crack and Ciphers to Break
For ten years, Robert Allen was Editorial Director of Mensa Publications and became one of the founders of Carlton Books' puzzle list. He now has a couple of dozen puzzle books to his credit and has been published all over the world. He lives in a village on the outskirts of Cambridge.--This text refers to an out of print or unavailable edition of this title.