Most visitors never step outside the medieval walls — this treasure hunt takes you through the Bastide Saint-Louis, the real heart of Carcassonne, where locals live and shop every day. Step back to 1688 and help Lucas Maffre, a cloth merchant, solve a mystery. For generations, his family has used a warehouse that his neighbour Séraphin Bosc now claims as his own. Séraphin has a deed, but Lucas's wife Marguerite is convinced it's a forgery. The real deed is locked inside a chest, sealed with three combination padlocks. Lucas's grandfather, Balthasar, saw things others couldn't. Before he died, he left behind a letter full of riddles, hidden in nine places across the bastide. Begin at Place Carnot, where Lucas is waiting with the letter. At each stop, read a passage, observe, count, note down your number. Take your time — I'll recommend cafés along the way. At the final stop, arrange your nine numbers into three groups of three. You have three attempts.