Sometimes she imagined she was a superhero, but she never thought it would really happen one day. It was a Friday evening when her mum asked Lena to carry old books up to the attic. The attic of their house was full of cobwebs, creaking boards and objects that remembered the days of her great-grandparents. However, that day Lena noticed something strange - there was a shiny key lying on one of the trunks that she had never seen before. Lena picked up the key and at the same moment felt as if the air around her had thickened. A hair elastic fell out of her pocket and she reflexively bent down to pick it up. Suddenly she heard footsteps - her younger brother Philip had entered the attic. "Lena? Where are you? After all, you were here just now!" - he quipped. Lena was standing right next to him, but when she looked at her hands, she saw... emptiness. She was invisible! Philip looked around confused, and Lena tried to speak up. "I'm here!" - she said in a trembling voice, but Filip stepped back frightened, as if he had heard a ghost. After a moment, Lena refocused on the key. Outlines began to emerge from her body - she was visible again. She and Philip sat down on an old trunk and began to guess what had just happened. "Maybe this key is enchanted?" - Philip asked. Suddenly, a quiet sound came from the darkness of the attic - as if someone was whispering their names. The door of a small cupboard in the corner swung open slowly, and a mysterious blue glow flashed from behind it. Lena and Philip looked at each other with baked faces. Should they check what was hiding behind the door? Did the attic hide more magical secrets?