The Munot was called Albrecht Durer's folly by de Shepherd because only an artist such as Durer - who is thought perhaps to have designed it - could conceive of a Swiss fortress with an impressive but vulnerable design on the German side of the Rhine. A single cannon shot was enough to bring it crashing to the ground. To crown it all the folly's bell for sounding the alarm was flawed ; it was cracked. Whether or not the cracked bell was intended it leaves the Munot unsurpassed as the folly of follies.
Guy and Bebe wondered what the master might have left within the crack and toyed with the idea of discovering it.