This week, the blacksmiths begin their attempt to turn stone into metal. Yohann sets out to discover what French masons do with a "grasshopper". Constantin, as always, has the answer!
In this final installment from the lime kiln, Yohann and Fabrice slake quicklime to produce lime putty. True or false: a castle was always fitted with a drawbridge? The master-mason provides the answer...whilst operating the treadwheel winch. And the subject of the next 5 episodes is revealed!