If not you, who? If not now, when? This was the challenge answered by Stephen Foreman and his wife, Emily, when they traded in their American white picket fence for a giant, dusty sandbox as missionaries in the deserts of North Africa. Stephen had given Emily a well-read copy of Foxe's Book of Martyrs on their first date, a telling foreshadowing of the ultimate cost he would pay when, at 39, he was shot and killed by al-Qaeda operatives in 2009