Spacer and Rat Jack must help a woman who comes into the pub. She tells him that she's looking for a self-aware robot. Jack laughs at her, then stops when she produces some money. He tries to find the bot, and ends up overhearing a conversation about the bot. He sends off the woman in chase of the robot. Then his friends corner a rat, but this is the rat that he knows. He doesn't wasn't to hurt her, so he runs with her to the chapel. There he finds out that Kit, the rat, has been hoarding the bot. It was built by her father, and he told her to get to another port to deliver the bot. The two kids run away with the bot, which appears to be sentient. Jack and Kit honor Kit's father last wish, to keep the bot safe from any harm.
This book is a really short read. I think it is very appropriate for younger kids. If you're bored and are looking for a good read, then this book will suit your needs. The author put a lot of detail into this book, and this made it one of my favorites.