As with many of the great ones this is a remake of the 1937 movie and was made again in 1985. Just as we all know that Moses looks like Charleston Heston, we also know that Allan Quatermain looks like Stewart Granger. The movie also has many other greats as Richard Carlson of "Creature from the Black Lagoon" fame.
Basic story is an adaptation from H. Rider Haggard, in which Elizabeth Curtis comes to Africa in search of her, lost husband and eventually uses a large sum of money to recruit Allan Quatermain against his better judgment to lead the search. Naturally the two people even thought chaperoned have to resist nature taking its course.
Eventually picking up a stranger (Umbopa) going their way they run into danger from animals, natives, and unscrupulous people. The title gives away the reason that the husband (Curtis) was in Africa to begin with. Will Curtis be found and what effect will it have on Allan and Elizabeth?