While gathering research for the puzzles she sells to newspapers, Vivian, the widowed Viscountess Rowden, literally stumbles across the arrogant Duke of Whitley. Whit, known to the ton as the Ice Duke, is spymaster for the Crown, and he has evidence of enemy agents using newspaper ciphers to send coded messages to Napoleon's army. His mission is clear—less clear are his feelings for the woman he may have to destroy. While Vivian struggles to put the past behind her and find a future where her heart can be safe, the duke must decide whether the lovely and independent viscountess is friend, foe, or fate.