emerging after dark from two doors down 's garden shed with its bath-tub and corrugated iron , scherzo crept on all fours through the rose bushes marking the disputed boundary between that garden and mrs fry 's , melding with the aforementioned as a curtain twitched , wary of discovery , imitating foliage and washing as he neared the crumbling brick wall separating mrs fry 's well maintained flowerbeds and lawn from his disordered own .