Under the Desert Sands

On honeymoon, an archaeologist couple, Toby and Lucy, meet an emergency on Lake Nasser. A man, Hassan, was being attacked by a crocodile. Can they rescue him? Will he survive?
Leaving the lake for the Western Desert and its oases. They go to Kharga and have a wonderful party. A fantasia entertains them with whirling dervishes, Nubian dancers and pipes of hashish being handed around. Then back on to the White Desert, a "Wonder of the World". They get stuck in the deep sand and freeze in the cold night; dug out, a surprise in the hole left by their rear wheel.
Is it what they hope? Is it part of a temple? Is it an archaeologist's dream or just a lump of stone?
Lucy bewitches a colonel in the Baharyah Oasis; he brings manpower to raise the block. Suddenly, the edge of the deep trench crumbles and sand and rubble collapse into the hole. What will become of the young couple?