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This novel is about a man who devoted his life to enriching and prospering the Holy See and the Cartesian Order. His name is Defan. At the beginning of the XIV century, he began his career as a humble novice in the monastery of Chartres de Villeneuve, and ended it as a cardinal and treasurer of the papal court. It was he who created a unique financial system, opening up new sources of income and laying the foundations of the modern economy. He was the first to cooperate with banks, monetised faith, laid the foundations of the book trade, introduced a system of cashless payments and created products that brought worldwide fame to the Cartesians. Who, for example, hasn't heard of the famous Chartreuse liqueur? It's also a Defan!

A remarkable life as a great existential adventure on the verge of the Renaissance.