They've faced an entire spectrum of threats from this universe and beyond. None could withstand the power of the Green Lanterns' light. But the Green Lantern Corps is about to be pushed to the breaking point by a threat it can't see coming. The shape-shifting alien race called the Durlans has declared war on the Corps. They've hired mercenary armies to take down Lanterns by the dozen. They've infiltrated the Corps' headquarters on the living planet Mogo by impersonating the Lanterns' closest supporters. They may even have sleeper agents in the ranks of the Green Lanterns themselves.