One Dance With a Duke: A Rouge Regency R

A handsome and reclusive horse breeder, Spencer Dumarque, the fourth Duke of Morland, has a reputation as the dashing "Duke of Midnight." But none of the ladies of the ton catch his interest for long, until Lady Amelia d'Orsay tries her luck.

In an effort to get the Duke to forgive her brother's debts, Amelia claims the duke's dance.