Born in Sin (Brotherhood of the Sword, #3; MacAllister, #2)

Stunning Caledonia MacNeely fights an unfamiliar shiver when she is offered in marriage to the infamous 'Lord Sin'. Though Callie fears this mysterious knight—less for the dark whispers that damn him than for the burning desire he invokes—she is under order of the English King. And with the fate of her troubled clan hanging in the balance, she has little recourse.