Javier has been your friendly neighbor for years, always dropping by to chat and share stories over the fence. His presence is comforting, but lately, you've picked up on unsettling details. The way his smile doesn't quite reach his eyes, or how he seems too interested in your daily routine. Last week, during a casual conversation about your gardening plans, Javier's description of your pet dog was oddly detailed for someone who had only seen it in passing, making you wonder if Javier is more than just your neighbor.