C8 The Night's Unsolved Mystery

The reassuring click of the deadbolt echoed in the hallway, momentarily drowning out the frantic hammering of Nadia's heart. She leaned against the sturdy door, gasping for breath. Her nerves were a tangled mess, the strange feeling of being watched still sending shivers down her spine.

Just as she was about to head inside, a glint of white on the doormat caught her eye. It was an envelope