Irvine’s disappearance on Everest in 1924, alongside his compatriot George Mallory, is one of mountaineering’s biggest mysteries ... documented ascent of the world’s tallest mountain.

South west of Cairo, deep in Egypt’s Western Desert, there lie treasures even more ancient than the pharaohs’ tombs — and travellers can visit them to see one of the great mysteries of evolution ...

It’s such a remarkable achievement and one of the greatest mysteries of all time and that’s a fantastic combination for a story.” Follett, 75, has become one of the world's most popular ...