I've completed, and enjoyed, this puzzle (not without a little help from this splendid thread) ....but have one lingering doubt. How is the book title a " striking thematic example " ? The YEAR divides neatly into a multiple and a prime number, but THAT prime number is NOT the thematic one ! Encoded I have a letter plus two digits, and assume this is correct but am unsure, as hinted for the reason above. Do I have the wrong title by Mr. E.B ? aka ....Any reassurance would be welcome !