Synopsis
Nick, Katie and their neighbours, Mike and Penny, are enjoying the end of the summer holidays. When Uncle Bob comes to stay for a rest, he seems a bit bored without his exciting private investigator's job to do, so the kids give him a riddle to solve, which unexpectedly turns into a real mystery.
From the Back Cover
ANOTHER PUZZLING RIDDLE TO SOLVE!
Nick and Katie and their neighbours, Mike and Penny, are enjoying the end of the summer holidays. When Uncle Bob comes to stay for a rest, he seems a bit bored without his exciting private investigator's job to do, so the children invent a riddle for him to solve. But life soon becomes very exciting when cracking the kids' code leads to a real-life mystery with serious consequences.
ANOTHER PUZZLING RIDDLE TO SOLVE!