A cave in of a local canal tunnel under restoration reveals the skeletons of eight individuals. While most of the skeletons are from a cave in when the canal was under construction in the 19th century, one is obviously of a more recent vintage. Dental records identify him as Eric Edwards who was reported missing in 1965. Supt. Barnaby delves into the history of the canal to see if he can find a connection. DS Troy is over the moon when he learns that he has qualified as a Detective Inspector and that there may be a job for him in another county. In what may be his last case in Midsomer, he follows up on an anonymous tip that teenagers are harassing a local hermit, Tom. When one of those teenagers is shot through the head, Barnaby leaves "Inspector" Troy in charge of the case.,“算了，你肯定生我气！”天雪闷闷地说，“你干嘛要委屈自己？就算是为了阿姨，你也不能忍气吞声，不然她更觉得你好欺负！欺负完你，就该去欺负阿姨了！杜伯伯家教很严的，要是被他知道，杜倩吃不了兜着走！”……