I am really interested in anything to do with Bletchley Park so this book was a definite must-read for me. It was great hearing about all the familiar locations and getting a few famous names dropped in here and there! I loved Robyn from the start, she was so brave and inquisitive, and good at being sneaky when she had to be. She could clearly cope with a lot more than her parents and the other adults gave her credit for. Seeing the Park from her point of view was really interesting. How strange it must have been to have your home suddenly full of unknown people and secrets, and how scary to be the youngest to ever sign the Secret's Act! The story wasn't as as action packed as I expected from the description. I wasn't so sure with the way a couple of months kept passing without anything really happening though it was still an enjoyable and interesting read.