As a foreign correspondent covering war in Syria, Deborah Campbell relied on a local fixer named Ahlam to connect her with sources. And when Ahlam was arrested and dragged out of her home, Deborah was filled with guilt. She joins us to tell the story of her quest to reunite with Ahlam, which she writes about in “A Disappearance in Damascus: Friendship and Survival in the Shadow of War”(Picador).