The United States, China and Russia eye each other across a 21st-century version of the Cold War, which suddenly heats up at sea, on land, in the air, in outer space and in cyberspace. The fighting involves everything from stealthy robotic-drone strikes to old warships from the navy’s “ghost fleet.” Fighter pilots unleash a Pearl Harbor-style attack; American veterans become low-tech insurgents; teenage hackers battle in digital playgrounds; Silicon Valley billionaires mobilize for cyber-war; and a serial killer carries out her own vendetta. Ultimately, victory will depend on blending the lessons of the past with the weapons of the future.