After breakfast the three went to the closet where the robot was kept. The captain pressed the door button, and the door slid open, revealing the hulking monster that had frightened Garry the night before. Even now, Garry felt chills along his spine. Captain Eaton spoke one word, “Follow,” and then turned on his heel, heading on down the corridor. The boys tagged along and were amazed to see and hear Katrinka clomping behind. “She _is_ following, Garry!” Patch said. “Yeah, and I still don’t understand it,” his friend replied, with a shake of his head. “Why, that’s the easiest command of all I’ve given her to do,” Captain Eaton said. “The word ‘follow’ activates a sort of radar device in her and makes her follow the closest moving object. I believe that was what happened when she chased you last night, Garry. Something slipped, causing her to follow that particular action.” The captain chuckled. “She could have pursued you all night, but she never would have come closer than three feet.” The _Carefree_’s skipper entered a doorway leading off the corridor. “Here’s my workshop. I’ll have a look at Katrinka’s workings now,” he said. The shop was untidy, cluttered from top to bottom with electronic parts, tools, and metal plates. Captain Eaton gave Katrinka the command to stop and then with a screw driver removed a large plate from her back. He nosed about inside the robot for several minutes, making adjustments within the complicated network of wires and miniature parts. Then he replaced the plate. “Just a couple of wires got too close,” he said. “She won’t be chasing you any more, Garry.” “That’s a relief,” Garry replied with a nervous smile. “I wouldn’t want to go through that again, even if she _is_ harmless!” “I’ll show you how I build commands into her system,” the captain said. “Let’s have a simple command, fellows.” “I know,” Garry replied. “Have her lift up Patch.” Patch backed off hastily. “Oh no you don’t!” he objected. The master of the _Carefree_ laughed. “Be a sport, Patch. She’s very gentle. She won’t hurt you,” he said. Patch thought a moment, then replied, “Okay, if you promise it will be all right.” “I promise,” the captain said, and he set to work. He brought out tools and equipment of every kind. Then he removed some plates from various parts of the robot’s body. But instead of tinkering around inside, as he had done before, he opened up a big chart and began working from it, using pencil and paper. “What are you doing, Captain?” Garry asked after a few moments.