Shepherd's Stone (Book Five)

the time-traveling trio wind up in Bethlehem, where they quickly befriend a young David. When David brings food to the Israelite army, Peter and Mary go with him and witness the mighty taunts of the giant Goliath. As the clock runs out, Peter and Mary uncover a treacherous plot, help David prepare to face Goliath, and battle a mischievous and familiar enemy.