Since the devastating explosion of a store of ammonium nitrate in Beirut’s port on August 4, Lebanese citizens have taken to the streets in shock, outrage, and grief. Above all, they have demanded answers: Where did the nearly 3,000 tons of explosive chemicals come from, and who owned it? Why did the rickety ship that brought the hazardous material to Lebanon end up stranded in the city’s port in late 2013? And how could the impounded chemicals sit for over half a decade in an unsafe warehouse before tragedy finally struck? In Lebanon itself, the causes of the disaster appear...