Write a story about a group of young friends who stumble upon a mysterious key while exploring an abandoned mansion on the outskirts of town

Write a story about a group of young friends who stumble upon a mysterious key while exploring an abandoned mansion on the outskirts of town. As they try to unlock the mansion’s secrets, they realize that the key holds the power to unlock hidden passages and reveal long-lost treasures. But they soon discover that they are not the only ones seeking the key, and they must outsmart a group of rival treasure hunters to claim their prize.