The Inventors and the City of Stolen Souls

“It's the robots, Cat. They're back, and they're stealing people's souls.”

Nate and Cat are still mad about inventing, but it's a dangerous game. Having narrowly defeated the crazed genius Ebenezer Saint, strange things are happening back home. What is Saint's building company up to? Why is everyone in the town acting crazy? And who is the metal man with golden eyes staring at them from the shadows?

Soon Nat and Cate are plunged into a terrifying conspiracy, one that could see the human race reduced to mindless robotic slaves. They must rely on old friends, dangerous allies and even wilder inventions if they want to save the world.

Once again they have to out-wit, out-run and out-invent the world's greatest inventor, but this time there's a whole army to defeat.