The Artevelde Brewery

While excavating a cellar, an old medieval city was discovered. There is an Artevelde café in the already excavated streets. Old texts tell about the old original Artevelde beer recipes that can be found in the brewery, hidden somewhere behind the café. You are hired by a guard of the archaeological site and he wants you to try to steal this ancient beer recipe. It must be found at all times. Why? It can make you filthy rich! No time to lose, because the guards will be changed in 70 minutes!