When Nathan's Dad is arrested for breaking the Official Secrets Act, he leaves Nathan a message; a riddle he must solve. This leads him on a trip around the neighbourhood all started by Lily Kenley, a Bletchley Park employee in the 1940s. With his mum slowly losing it, and his sworn secrecy to tell no one, what will he do?

With the help for his friends and mysterious people who seem to be in the right place at the right time, Nathan must solve the mystery before the Ministry of Defence figures out what he is up to.

This book is all about what you do when entrusted with a secret. Nathan has a choice, but what will it be? I loved this book because it incorporated mystery, history and adventure all into one book. The author cleverly tells you two stories, Lily's and Nathan's, in one voice. Although it only came out last year and this is only Ruth Eastham's second novel I feel that she is a very experienced writer and always knows how to hook her readers! This book should definitely make the bestsellers list; I could not find any faults; none at all.

Overall I would give this book a 10/10 – definitely prioritise this on your 'to read' list!

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