The Last Secret of the Ark — James Becker

A search for the world's most sacred relic leads to a desperate race for survival in the international bestselling author's “utterly spellbinding” series (Euro Crime, on The First Apostle). Detective Chris Bronson and museum historian Angela Lewis are on the hunt for the Ark of the Covenant. Their search has brought them all the way to Ethiopia, but now it looks like their luck is running out. Until, that is, a new avenue springs open in southern France.
Meanwhile, the Vatican is getting worried. Their best people are tracking the Ark, but so is a mysterious group operating from Jerusalem. Both are prepared to use deadly force. As the net closes in around the most powerful artefact in history, it's also tightening around Bronson and Lewis. In this deadly game of cat and mouse, the secret to survival may be hidden in the ancient past . . .