The Carswell Covenant

Soon after discovering that the Bible's Old Testament left out a revealing passage about the Israelites' exodus from Egypt, computer wizard Steve Fisher comes across the name of his deceased grandfather, Clarence Fisher, in a popular mystery novel.
Eager to learn more about his grandfather, an archaeologist who died mysteriously, Steve sets out on a sixteen-day trip through Egypt, accompanied by his brother, Glenn, and a striking and brilliant archaeologist named Tina Gilbert.
The trio uses a map that Clarence drew by hand during his college years to search for an undiscovered tomb, but they stumble upon unthinkable revelations about the past-as well as unforeseen dangers.
In the midst of gunfights, terrorists, and kidnappings, Steve, Glenn, and Tina unlock the explosive mysteries for which Clarence gave his life decades earlier.
They discover that the secrets they encounter have the potential to turn the religious world upside-down-but the details are useless if Steve, Glenn, and Tina can't escape those who are after the very same secrets.