John Law is a man full of secrets. People call him the Cryptographer, or the Codemaker. He is mysterious and charming, the world's first quadrillionaire, the inventor of an unbreakable code, of a new form of electronic money. As a man, he is admired and distrusted more than most. Tax inspector Anna Moore's talent is for getting clients to talk. She is good at what she does, one of the best. So when the Revenue assigns John Law as Anna's new client, her first task is to discover just what it is he's trying to hide...