They keep their honey bees in unlikely places -- on the rooftops of high-rises, next to charter schools, behind row homes, and on abandoned lots. Some want to give the bees a haven away from the pesticides so often found in rural and suburban locations. Others want to increase the production of urban farms and gardens. All of the them share a love for these fascinating insects. All of these beekeepers also know a terrible truth: the honey bees are in trouble. What exactly is causing bee die-offs and Colony Collapse Disorder remains unknown, and the way to save them a challenging mystery. But...