Francesca, Lady Haughston, steals the story, she's the best character. She's the facilitator, matchmaker, who steps in to save the day. Her foil, the Duke of Rochford, also has a star turn, as Francesca revises her opinion of him at the end of the book.
But the main story is Callie and Bromwell. Callie is the Duke's much younger sister, overprotected, and a bit naive. Bromwell is a charming stranger who her brother warns her away from, even though he's probably the most eligible gentleman on the Marriage Mart.
But wait, there's the suspicious behavior of Lady Swithington, Bromwell's much older sister. Is she trying to promote a match between her brother and Callie? Or does she have darker motives?