Cassie fumbled helplessly beneath the shade of the ancient oak, still searching for her second shoe.The first had been easy to find, having landed close to where she had kicked it off; and when her hand had finally encountered it, she clutched it to her breast in a gesture of smug triumph. For one brief moment, she felt a twinge of sympathy for the sighted people who would never experience such sweet victory from a task as simple as finding a shoe.