Devise a mystery involving an aged, deserted mansion locally rumored to house hidden treasures.
Delve into the spine-chilling ambiance of an abandoned mansion in your neighborhood, famed for its supposed concealed riches never found. Describe what happen when a group of youngsters decide to explore it one night. Keeping the eerie atmosphere intact, piece a narrative involving suspense, thrill, secret rooms, and unknown entities. This is an opportunity to experiment with descriptions, tension-building, and impactful character reactions.