Sentence:  This is a novel by the author of The Love of Stones (2001). "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 <WSD>quadrillionaire</WSD>, the inventor of an unbreakable code, of a new form of electronic money called Soft Gold. 
Meaning of the word marked with <WSD> tags:  Somebody whose wealth is greater than one quadrillion units of the local currency.