“It all depends on how dry the bones were initially and how dry they have remained. If the ossuary is still sealed, it’s a possibility, and if it is possible to retrieve some of Mary’s DNA, then it’s too bad she had only a divine son and not a divine daughter.”

A crooked smile spread across Shawn’s face. “What a strange comment! Why a daughter and not a son?”

“Because mitochondrial DNA is passed on from generation to generation matrilineally. Males are genetic dead ends, mitochondri ally speaking. Sperm don’t have much mitochondria, and what they do have dies off after conception, whereas ova are loaded with them. If Mary had a daughter who had a daughter, et cetera, until current day, there might be someone alive today with the same mitochondrial sequence. By coincidence, the mitochondrial DNA has a two-thousand-year mutational half-life, meaning that after two thousand years, statistically speaking, there’d be a fifty percent chance the DNA sequence would be unchanged.”

“Actually, there’s a very good chance Mary had a daughter—in fact, not one but three of them.”

“Truly?” Sana questioned. “I recall she had only one child, Jesus. That’s what I learned in Sunday school.”

“One son is Catholic dogma, Eastern Orthodox creed, and even the belief of some Protestant denominations, but there are many people who think otherwise. Even the New Testament in the Bible suggests she at least had other sons, although some people think the term ‘brother of Jesus’ means another close relative, like a cousin, a debate that arose during translation from Aramaic and Hebrew to Greek and Latin. But I, for one, think a brother is a brother. Besides, it makes sense to me that she had more children. She was a married woman, and having a bunch of kids the normal way certainly wouldn’t have taken away from having the first one mystically, if that’s what happened. And I’m not making this up. There’s an awful lot of early Christian apocrypha, which didn’t get chosen to be canonical by being included in the New Testament but which state she had up to eleven children, including Jesus, three of whom were daughters. So there might be someone out there with the same DNA.”

“Now, that would put my field of mitochondrial DNA on the map,” Sana said, while imagining writing the paper for Nature or Science with such a suggestion. In the next instant, she was mocking herself. She was getting as bad as Shawn by jumping the gun and entertaining far-fetched delusions of grandeur. Maybe she was even worse, since Shawn was already much more famous in his field than she was in hers.

“Getting back to reality,” Shawn said, “our Egyptair flight leaves Cairo at ten a.m. tomorrow and arrives in Rome at half past twelve. We’re staying at the Hassler. Why not celebrate this coup in style. So, what do you think? Are you coming with me? If all goes well, it’s just an extra day, and the payoff will be immense. I’m truly excited about it. As my last hurrah at fieldwork it will seriously aid my fund-raising.”