In the 1980s, a young adventurer and collector for a government library, Abdel Kader Haidara, journeyed across the Sahara Desert and along the Niger River, tracking down and salvaging tens of thousands of ancient Islamic and secular manuscripts that were crumbling in the trunks of desert shepherds. His goal: to preserve this crucial part of the world's patrimony in a gorgeous library. But then Al Qaeda showed up at the door.