You wouldn't think a 48-page kids' book would take me a week to read. But this book had all sorts of puzzles that had me flipping back to pages with clues, and the illustrations (by Mark Burgess) were full of little visual jokes. The puzzles weren't exactly hard, but some of them did require me to actually write things down in order to keep track of them.
The story itself was pretty silly, and the codes were highly unrealistic, but I think this is a fun intro to the concept of code-breaking. I know I would have enjoyed it for that when I was a kid. I think this format is also good for developing reading comprehension. I would also recommend this to kids who enjoy Choose Your Own Adventure and Encyclopedia Brown books.
I think that this book is very interesting as it is an adventurous story. The book talks about a adventure with 3 main characters named, Polly, Annie and Joe. Polly was captured and her friends found it out and started an adventure to rescue her, at first, they misunderstood the case and nearly got themselves into big trouble, but at last, everything turned out right. To know more about the story,you would need to read the book yourself. I recommend this book to teenagers ranging from primary to secondary, although the book has few pages, it has a lot of mind solving puzzles or words and sentences suitable for secondary students, the book gives kind of a mystery to the reader.
Must have read this a hundred times growing up. Still a great story with some fun puzzles. It's obviously more suited for kids but as an adult it's still fun to re-read every now and again.