[Animated short film: A dimly lit room, nighttime, no dialogue. The detective (@awdbis.scarlettsl) is serious and cautious.] 1. Wide shot: The door of an old wooden house is slowly pushed open, revealing a narrow gap. The detective's head slowly peeks through the gap, looking into the dimly lit room, then she quietly steps inside. 2. Medium shot: The detective (@awdbis.scarlettsl) stands in the center of the room, the beam of her flashlight slowly sweeping across dusty tables and chairs, and an overturned vase, finally stopping on a partially covered floorboard in the corner. Her brow furrows slightly, and she cautiously moves closer. 3. Close-up: The detective squats down, carefully brushing away the dust from the edge of the floorboard with her fingertips. Her fingertips touch a gap beneath the floorboard. A flash of alertness crosses her eyes, and she quickly pulls out a magnifying glass and brings it closer. 4. Close-up: Under the magnifying glass, half of a metal button is clearly visible in the gap of the floorboard. The detective picks up the button, examining it carefully in the faint light filtering through the window. In the shadows behind her, a blurry silhouette flashes by. 5. The detective turns around in surprise.