David is successful. His carpeting cleaning business is earning him much more than the pocket money of other kids in his Year 6 class. But cleaning isn't his calling. After inheriting his grandfather's practice, being a private investigator is what he really wants to be.
His first assignment is simple. Catch a school lunch thief. That leads to a contract to protect Vanessa Wu, the daughter of a very rich Chinese businesswoman. All Dave has to do is be Vanessa's partner at a birthday party to collect a very big pay packet. It is an easy assignment until Chinese gangsters attempt to kidnap Vanessa. David, with the help of a schoolmate, Romeo, spends the weekend outwitting the would-be kidnappers by showing Vanessa around their town, and having fun in the process.