A jealous speleologist wife, in order to take revenge on her husband for betrayal, lures him into a labyrinth cave. The poor fellow is doomed to die - in complete darkness, with a minimal supply of food and water. But he's not going to give up. His life in the labyrinth is richer than Crusoe's adventures on a desert island. And here is the reward - the indomitable prisoner manages to find the most precious of earthly treasures in the dungeon...