This book had me gripped from the start. I just couldn’t put it down. I must have read at least 4 chapters a time and if I could I would have probably read more. The plot had me guessing from beginning to end and I never expected the end to turn out like it did. It has lots of plot twists and each word draws you in further and further. Professor meets spy and a whole lot of travelling to different parts of the world. The different routes the book takes keeps you guessing as to who is really the German spy. I loved that I was constantly changing my mind on who the culprit was and who was to blame for all the events that happened throughout. I would definitely recommend this to people even those who originally don’t think this is a book for them. 5 stars from me and that is saying something as I normally don’t give more than 4. All I can say is it looks big but you’ll soon get through it.