Finn explored deeper into the island and discovered an ancient castle ruin. The castle looked long abandoned but still held its mystery. Finn turned on his flashlight and carefully entered. The castle was full of dust and cobwebs, but paintings on the walls seemed to tell stories of the past. Shell suddenly stopped and said to a corner, "There's something there..."
In the ruins, Finn discovered an ancient notebook. It recorded the island's history and clues to a hidden treasure. Finn carefully read every page, memorizing important information. Though the ruins were dilapidated, every stone seemed to tell an ancient story. Shell quietly accompanied him.