Code-loving Max is unexpectedly recruited to spy on his friend's uncle, a suspected terrorist. But nothing is quite as it seems in this new world of espionage, double-crosses, kidnaps and car chases - and in the end, it may be Max's skill with word puzzles that saves the day. A thrilling, non-stop adventure packed with puzzles for the reader to solve.

Series Consultant Gill Matthews is a literacy consultant and writer, and series editor for several major literacy programmes. She was involved in the development of the non-fiction element of the Primary Framework for teachers, and is a leading advocate for the need for quality non-fiction in literacy teaching.