Amid the turbulence of the 2011 Arab uprisings, the revolutionary uprising that played out in Cairo's Tahrir Square created high expectations before dashing the hopes of its participants. The upheaval led to a sequence of events in Egypt that scarcely anyone could have predicted, and precious few have understood: five years on, the status of Egypt's unfinished revolution remains shrouded in confusion. Power shifted hands rapidly, first from protesters to the army leadership, then to the politicians of the Muslim Brotherhood, and then back to the army. The politics of the street has given way...