With His Lady's Assistance — Cheryl Bolen

The prince regent recruits Wellington's best spy, Captain Jack Dryden, to find out who's trying to murder him. But in order to mix in the highest echelons of English society, the exceedingly handsome spy must feign an engagement to the prodigiously plain spinster Lady Daphne Chalmers. As this unlikely couple's investigation deepens, so does their attraction to one another.