It was the SCA and its head, Akil Mansoor, that had proved to be the lynchpin of this whole project. Mansoor was not only an enthusiastic supporter of the project, but also Gabrielle’s mentor – she had done her PhD under him at the University of Cairo, and their friendship had proved enduring, if somewhat volatile at times. He was also a friend of her uncle, the much respected British biblical historian, Harrison Carmichael. Perhaps most important of all, he was the Vice Minister of Culture.

But not even he could override security considerations or the wishes of the Egyptian military, and he had been forced to engage in a certain amount of horse-trading as he gingerly tiptoed around the objections and won over the key decision-makers in the political and military hierarchy.

And now with the job of brokering the deal accomplished, he stayed away from the site and let the enthusiastic kids rise to the challenge of ‘painting the fence’ – with his young, attractive protegee playing the role of Tom Sawyer. Of course, if they found anything exciting, he would lose no time in going out there to make the official announcement in front of the cameras.

The volunteer who had just emptied his bucket into the sieve screen that Joel was operating didn’t wait to see the results, he simply returned to his digging. The screen consisted of a four-sided wooden box with a quarter-inch metal mesh ‘floor’ and a pair of handles that could be used to shake it.

Joel shook the screen now to begin the separation process, and as the sand fell away through the mesh, a large number of stone fragments remained. Normally the residue proved to be nothing but desert pebbles, but this time something caught his eye. Mindful of Gabrielle’s instruction to observe the residue before bagging it up, he looked more closely, blinked and then looked again.

It wasn’t that the stones were of any radically different material – quite the contrary: they were typical of the local stone – nor were they any larger than usual. And they certainly didn’t have the glint of noble metals or the crystalline glow of precious stones. No, it was just that these stones, or rather fragments of stone, seemed to have markings on them.