The Imp of the Clenchwarton Night Blight

There are malevolent, ghoulish spirits afoot, administering a devastating night time blight in the parish of Clenchwarton. At least, that's what the ladies of the Clenchwarton Horticultural Society believe, after they discover, to their horror, their prized plants and vegetables are being "murdered" one by one by a mysterious, malicious entity after dark. Who, or what, is to blame for these wicked, cowardly, crimes? And for what purpose? But, more importantly, whose prized exhibits will be next?