In her remarkable book, In Code, Sarah Flannery demonstrates a flair for explanation and a genius for mathematics that would be remarkable in any seasoned academic. In a sixteen-year old girl, it is nothing short of miraculous. This engaging, and rather touching story, is sprinkled with very digestible chunks of mathematics, ranging from the simple to the very complex, and some marvellous puzzles which really challenge the mind.
Sarah's beautiful writing style has drawn comparisons with other esteemed mathematical writers such as Simon Singh and Martin Rees, and justifiably so. My sole complaint with the book is the lack of description on Cayley-Purser, Sarah's algorithm, and the subject of the book. This is a fantastic book, and its combination of fascinating mathematics and an inspiring storyline is sure to interest everybody from the experienced cryptographer to the general reader.