The Passionate Flame — Denise Robins

When Peril Grant went to Rhodesia to live with her only remaining
relative, Amy Johnson, a permanent invalid, she had visions of it as a
golden land of rolling plains, the finest countryside in the world. The
heart-break, passion and tragedy that followed were nightmares she had
never dreamed could never happen anywhere on earth. And when she awoke,
there was David...