Vampire Legacy (Book 4 of the Dragon Heat Series‪)‬

When Tardieh discovers a letter from his late father, he opens a door to old memories. The letter from Petran is a tale of intrigue, attempted murder, and betrayal, but leaves more questions than answers in its wake.
Petran, the King of Vampires, an ancient monarch known for his cunning ploys and many lovers, knows the animosity between draconians and vampires is brewing in Romania. Upon discovering his draconian neighbor has fallen ill with a strange Curse, Petran is determined to discover the cause, and a cure. In doing so, he finds an unexpected ally in his neighbor’s daughter, a striking Draconian Duchess.
All Lady Natalia, the Duchess of Moldavia, wants is to save her people from a Dragon Lord’s tyranny but she’s only a woman, who has no place meddling in politics. With his health failing, her father has big plans for her, so when the King of Vampires agrees to help her find a cure for the Curse plaguing her people and her father, Talia begins to see him as more than an old family friend. He awakens desires in her she knows she should not have but cannot resist, or deny him.