Codes have been used by spies, queens, mathematicians, generals, archaeologists - and you! This stylishly illustrated non-fiction book introduces the key concepts and figures in codemaking and codebreaking, from Caesar shifts to the Enigma machine. Discover snapshots of history, and learn simple codes! This book is a Readerful Book for Sharing. It is for an adult to read aloud to children aged 8 to 9. Readerful is a reading library specially designed to motivate children to read more. The series offers contemporary, inclusive books for children from 4 to 11 years, including: Books for Sharing: picture books to be read aloud by an adult for inspiring reading sessions Independent Library: fiction, graphic texts, character mini-series and non-fiction for children to read independently Rise: fully decodable books for older struggling readers to read independently. How Readerful works: - Read aloud the Books for Sharing for magical reading sessions that motivate children to read more. - Then encourage children to choose a book to read by themselves, from Readerful's Independent Library or from Rise. You'll find links between the books' topics, vocabulary, characters and authors - all designed to keep children reading, boost their vocabulary and develop their knowledge of the world around them.