In a small town in the north of the country, tucked away in a valley between high mountains, lived a group of friends. Their names were Thomas, Anna, Cuba and Alice. They were as close as four friends could be, sharing everything between them, from their sorrows and joys to their silliest jokes and most unlikely dreams. One hot summer afternoon, as the sun hid behind the clouds and the air became light and pleasant, they decided to go on a little adventure. They decided to discover the secrets of the old attic in Thomas's house, a place that had always been closed and full of dust. After much trial and error, they managed to open the door. When they entered, they discovered that the room was bigger than they had expected. It was full of old furniture, books and boxes full of unfamiliar objects. But what caught their attention was a strange object lying on an old desk, covered in a thick layer of dust. It looked like an old casket, but something about it was extremely intriguing. When they opened it, they came across an old, scarred map and a letter written in ancient script. At that point, they had no idea what the symbols meant, but they were fascinated and decided to find out more. Over the next few days, they spent many hours studying the map and trying to read the letter, which led them to increasingly strange discoveries.... And this is where the story stops, leaving the reader in suspense and curiosity as to what will happen next to the four friends, what secret the old casket holds and what else they will discover in their adventure.