Harvard grad student Eloise Kelly achieved the academic coup of the century when she unmasked the spy who saved England from Napoleon...

...But now she has a million questions about the Pink Carnation's deadly French nemesis, the Black Tulip. And she's pretty sure that her handsome onagain, off-again crush, Colin Selwick, has the answers somewhere in his archives. But what she discovers in an old codebook is something juicier than she ever imagined.

The Pink Carnation, history's most elusive spy and England's only hope for preventing a Napoleonic invasion, returns in Lauren Willig's dazzling imaginative new historical romance. The Masque of the Black Tulip opens with the murder of a courier from the London War Office, his confidential dispatch for the Pink Carnation stolen.

Meanwhile, the Black Tulip, France's deadliest spy, is in England with instructions to track down and kill the Pink Carnation. Only Henrietta Uppington and Miles Dorrington know where the Pink Carnation is stationed. Using a secret code book, Henrietta has deciphered a message detailing the threat of the Black Tulip.

Meanwhile, the War Office has enlisted Miles to track down the notorious French spy before he (or she) can finish the deadly mission. But what Henrietta and Miles don't know is that while they are trying to find the Black Tulip (and possibly falling in love), the Black Tulip is watching them.