In the far future, the technological disaster known as the Nanocaust left Earth uninhabitable. Archaeologist Verity Auger continues to explore the remnants of the planet's environment. But Verity is needed to examine something far more important-the discovery of mid-twentieth century Earth at the far end of a wormhole. And on this alternate world is a device capable of destroying both Earths if Verity cannot find the man preparing to detonate it in time.