Superman. Codename

"Zod, the military leader of the planet of New Krypton, has been shot. Chaos erupts as 100,000 Kryptonians fear that this is just the opening salvo in a full-scale war. As Zod's would-be assassin flees to Earth, it's up to Krypton's new commander Kal-El and his cousin Kara Zor-El--better known as Superman and Supergirl--to track down the gunman and bring him to justice. But returning to their adopted homeworld will be more dangerous than they can possibly imagine. The assassin has friends in high places here--friends determined to crush all opposition to their deadly conspiracy. And thanks to their twisted definition of patriotism, no one can be trusted."--Page 4 of cover.