As the title 'Allan and the Holy Flower' is a 1915 novel by H. Rider
Haggard featuring Allan Quatermain. This book is representing the
adventures of Allan Quatermain, great English hunter in the wilds of
Africa. This story relates an expedition for a rare orchid, and the
search for the kidnapped wife of one of Quatermain's friends. The lady
was missing 20 years earlier. The orchid search takes them to a
concealed dying civilization in which the flower is considered holy.