They refuse all attempts at communication.

Waking Gods, unlike the previous book, has an immediate threat and a ramping sense of tension as the alien robots seem bent on exterminating mankind, for reasons no one can determine. Themis wins, and all the other robots start releasing a toxic gas that kills 99.9% of the population within 20 miles. The result is a titanic battle between Earth's robot, Themis, manned by the only two people in the world who know how to pilot it, and the robot threatening London. Eventually, humans just can't resist poking at them, with an army. At first they are motionless, and impervious. 13 even bigger robots appear around the globe, standing in capital cities. In Waking Gods, the robot-builders arrive. What would we need a giant super-advanced robot to defend ourselves from? Yeah, that question shakes up a few governments. They also discovered clues as to why: it's meant to help humans defend themselves.

In book one, humans discovered and pieced together a giant alien robot that had been left here, in pieces scattered across the planet, thousands of years ago. Waking Gods, like the preceding book, Sleeping Giants, is told in 'captured footage' narrative style, though the circumstances in which some of these conversations are allegedly recorded, for later retrieval, make the device sound rather contrived at times. The greatest weapon humanity wields is knowledge in a do-or-die battle to inherit the Earth.and maybe even the stars. They can turn the tide if they can unlock the last secrets of an advanced alien technology. But Rose and her team at the Earth Defense Corps refuse to surrender. Now humankind faces a nightmare invasion scenario made real, as more colossal machines touch down across the globe. But the truth is closer now than ever before when a second robot, more massive than the first, materializes and lashes out with deadly force. As an adult she's dedicated her brilliant scientific career to solving the mystery that began that fateful day: Why was a titanic robot of unknown origin buried in pieces around the world? Years of investigation have produced intriguing answers - and even more perplexing questions. As a child Rose Franklin made an astonishing discovery: a giant metallic hand buried deep within the earth.

Sleeping giants waking gods