The fourth book in the series: “The Oldenburg Estate”.
Prince Vlad Oldenburg has been in captivity for a year now, held by a powerful person—the First Qadin Sultan Abdul-Aziz. The beautiful Circassian woman has a daughter, but the whole harem grows more and more convinced that the girl, whose face resembles a blonde angel, is not the ruler of the Ottoman Empire’s child. The woman and her daughter are in danger. Saving them makes Vlad attach himself to the little girl and her mother more and more. But his soul still longs for the only woman he, trying to forget her, continues to love. For love is as strong as death.
The book is based on historical events.