Jim Keller goes on the run but when the team speak to his wife Ann, it transpires that he was so haunted by his experiences in Bosnia that he wanted to forget them and in his own perverted way is doing the same for the colleagues he knew there whom he is now killing and ritually 'burying'. They eventually trace him to a deserted warehouse where he has brought his next victim and DS rivers is particularly heroic in attempting to safely apprehend him. (thetvdb.com)