The adventures of the choristers 2 - The treasure hunt

How boring doing nothing and the summer holidays had just started, what would we do all summer? Among our thoughts of boredom, comes back to mind a story of an old treasure hidden in the castle not far from us. Yes, it seems that there was a hidden treasure that no one had found. It is said to be hidden so well that only finding the clues you could find the treasure. Well you know, with such a boring summer ahead of us, we decided to try to find it. The only thing we knew from the stories of adults, as well as the existence of the treasure, was that the walls of the castle hid the clue. Then one day we decide and off we went to the castle in search of the treasure, but ...