It was a rainy evening. Sara was walking back home when she found a small, golden key lying on the pavement. It looked very old and mysterious. She picked it up and wondered, "What does this open?"
The next day, she went to her grandmother's attic. She saw an old wooden box hidden under a dusty cloth. Sara tried the golden key. With a soft click, the box opened. Inside, there were no jewels, but letters written by her grandfather many years ago. They were full of love and beautiful stories. Sara smiled with tears in her eyes. She had found a treasure of memories.