A cold-hearted Duke. A wallflower with a secret ledger. And a marriage that was never supposed to be a love match. Arthur Penhaligon, the Duke of Marwick, is a man of stone. Known as the "Iron Duke," he has spent years rebuilding his family's shattered legacy with ruthless logic and zero room for sentiment. When he finds himself on the brink of financial ruin, he calculates a final, desperate move: a marriage of convenience to a woman who will provide the capital he needs without demanding his heart.