Ormston's usually peaceful atmosphere is shattered when a certain Mr Tyldesley arrives in town. Not content with painting beautiful pictures of the local landscape, Dennis Tyldesley has taken to blowing up great swathes of it as well. After such an explosive introduction, Arthur, Brewer and Boynton confront Mr Tyldesley to ask just what he is up to, But, much to their annoyance, Dennis is not forthcoming, saying he is sworn to secrecy.