The world's most famous superhero, Superman's adventures protecting Metropolis have thrilled readers worldwide for over sixty years! Superman's world is turned upside down when all the world's Kryptonite is destroyed! But that leaves The Man of Steel anything but invulnerable as his powers slowly begin to fade...and a doppelganger Superman arrives on the scene with strange powers of its own. Can the World's Greatest Hero solve the mystery of the disappearing element and save himself? Legendary writer Dennis O'Neil ("Batman") and classic Superman artist Curt Swan present this classic tale, presented in a gorgeous, hardcover library edition!