The remote planet Narlash 4 appears to be the quiet home of a farm family. Few know it is the site of a secret, underground City of Robots. Pre-teen Jill Titan knows, and is thrilled to be going there with her father, a famed physicist. Before long she will find that there are mysterious goings-on in the city. Furthermore, she will have to deal with a spy called the Hawk and with an enemy spaceship ready for battle. It's a good thing this brilliant girl knows how to make allies of robots!