Central London, Autumn 2022.

I found myself standing in the middle of a luxurious penthouse with a perfect view of the Tower Bridge. It was the kind of place you see in movies—expensive, elegant, and way out of my league. I was there for a last-minute carpet cleaning job booked by a client, Mr. Zhang. But when I arrived, the apartment was completely empty. The doors were unlocked, and after several attempts to call him with no response, I started to feel uneasy.