In 1814, the Congress of Vienna has just begun. Diplomats battle over a new map of Europe, actors vie for a chance at glory, and aristocrats and royals from across the continent come together to celebrate the downfall of Napoleon. Lady Caroline Wyndham, a wealthy English widow, has a secret: her childhood in Vienna was stolen from her by dark alchemy. Determined to save her father, she isn't expecting to meet his apprentice, Michael Steinhüller, now a charming con man in the middle of his riskiest scheme ever. What price will they pay to the darkness if either of them is to survive?