The Beast of the Frozen Night Vol. 1 by Serena. F

Sold as compensation for her brother’s crime, Lady Angloranne Ribellois is ripped from the capital and delivered in a single day to the North—a winter-locked realm ruled by the elusive House Chromund. At the frozen castle, she discovers the old duke is a dangerously young predator with crimson eyes, a resident mistress, and no interest in ceremonies—only possession. Trapped in a court of cold silks, colder loyalties, and watching shadows, Anne must survive the beast who calls her his.