The Messenger Bird : The truth can be a dangerous thing by Ruth Eastham

Enemies on all sides. Nathan doesn't know who he can trust. It's a race against time. Get Dad out of prison. Mend a broken family. And solve the mystery of the messenger bird. Set around the top-secret Second World War codebreaking site Bletchley Park, The Messenger Bird is the gripping children's thriller from Ruth Eastham, award-winning author of The Memory Cage.
Binding: Paperback / softback