Austin and the Secret of Karnak House (The Austin Chronicles Children's Adventure Series Book 2)

The discovery of a coded parchment leads Bill, Mike, and Wendy to meet a mysterious inventor and archaeologist called Professor Pimlico. When the Professor tells them his story, they discover Austin's forgotten past with spies, secret codes, and a vital mission to save the world from destruction and slavery.

This book glimpses a time when mechanical computers look set to become the norm and the world is locked in a desperate struggle for survival against a seemingly overwhelming evil.