Tony Robinson and the team travel to the Welsh border in search of the abandoned Poulton Abbey that was once briefly used by Cistercian monks. Mick is delighted to be researching his favourite subject, monastic history. Though local archaeologists have found a chapel and plenty of other remains (including skeletons), there is no sign of the abbey. As the hunt drags on without any major progress, some of the team come up with a controversial theory. The team are joined by Mike Emery and Alan Wilmshurst from the Poulton Research Project, architectural historian Jonathan Clark, local historian Alan Thacker, and Finds specialist Debbie Klemperer.