Bennie Barrier returns in another big city adventure. Justin Case is a well known brief case in the city centre and can often be found in the offices around the city and knows about every business deal that is happening. On the morning of the court case in Southampton courthouse, Justin discovers that he cannot open his lock. The case in question: the sabotage of the traffic light system on the city ring road which caused a lot of problems for Bennie Barrier and his Maintenance Team. Can Bennie help Justin Case with his lock and discover who is trying to sabotage the case and prevent the Maintenance Team from keeping the city safe?