The Shadow of the Lynx by Victoria Holt

The Shadow of the Lynx - Nora Tamasin lived with her dreaming father until he went to Africa to search for gold and left her to the schools of England. When he dies in Africa, his business partner, Charles Herrick, send his son Stirling Herrick to escort her to Africa. However, they meet near the mansion known as Whiteladies. In Africa, Charles Herrick, known as Lynx, has built a replica of the home. He swears he will return to England a millionaire and exact his revenge on the owners of Whiteladies.