There is nothing to say, the holidays are starting off merrily - sidelong glances, offensive inscriptions on the walls... And all because there has long been a bad rumor in the village about the former owner of the farm where his nephew Michel settled. Is everything they gossip about really true? Convinced that this simply cannot happen, Michel decides to unearth evidence of his uncle’s innocence. True, you still won’t have to go underground to do this, but under water... The story was also published under the title “The Secret of the Sunken Treasure.”