Most romance novels are about courtship ending in marriage, but I'm a huge fan of romance novels about marriages and what makes them work...or not work. This one's a winner. Millie and Fitz have an arranged marriage, not untypical of Edwardian England--her money for his title. Both go into it with eyes wide open. Fitz loves another, and Millie knows it but is willing to take Fitz anyway.This book reminded me of Heyer's A Civil Contract, about a marriage that deepens into love, though Heyer's book never achieved the heights of passion that Thomas brings to her story. In addition, the author does a great job of unfolding the story over time, letting us see how the love develops between two protagonists who marry under stress, but learn to appreciate each other...and then some.