Amidst the enchanting snowfall and twinkling candlelight of Regency England's holiday season, a tale of redemption and reawakened hearts unfolds in Au Revoir, My Duke. Lady Charlotte Ashbourne stands on the precipice of ruin, her family's fortune ruthlessly stolen by the enigmatic and brooding Duke of Ravenscroft, Grant Tilbury. Driven by desperation, Charlotte is determined to reclaim her family's honor and fortune from the man who ruined them.

Grant Tilbury, a notorious rogue, revels in a life of vice and leisure with no intentions of settling down. However, when he crosses paths with the spirited and beautiful Lady Charlotte, he finds himself intrigued. Unable to resist the challenge, he makes her an indecent proposal. Seeing an opportunity for revenge, Charlotte devises a daring plan: accept his indecent proposal, make him fall in love with her, bring him to his knees, and then shatter his heart as he did her family's.

As Christmas magic weaves its spell, the boundaries between pretense and reality begin to blur. Charlotte finds herself unexpectedly drawn to Grant, discovering hidden depths and vulnerabilities in him that she never anticipated. Grant, too, is captivated by Charlotte's fiery spirit and unyielding determination, finding himself entangled in emotions he thought he’d forever forsaken.

With secrets unveiled and their game of hearts taking an unexpected turn, the holiday festivities become a backdrop for a passionate battle of wills. Will Charlotte's quest for vengeance be overtaken by an undeniable love? Can the rogue Duke find redemption in the embrace of the woman who sought to destroy him? As their hearts intertwine and the true spirit of the season works its magic, the fate of their love hangs in the balance. Will Charlotte bid adieu to the Duke forever, or will love triumph in the most unexpected of ways?