[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 cautiously peeks through the gap into the dimly lit room, then turns on her flashlight and 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 fingers touch a gap beneath the floorboard. A flash of alertness crosses her eyes, and she quickly takes 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 between the floorboards. The detective lifts 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.