Served Cold: Maid of Vengeance

Heiress Avira had everything until her governess Moira destroyed her family--poisoning her brother, driving her mother mad, and driving her father to his death. Then Moira took the fortune, married a duke, and rose to power. Twenty years later, Avira returns as Moira's maid, seduces the duke, and swears to make her pay for every crime.