Chen Shi asked, “I still have a question. What was the murder weapon?”

“You just said it was a hammer. Actually, it wasn't. It was ice cubes wrapped in cloth to keep the sashimi fresh. After killing that obsessive man, I put the ice cubes in the toilet tank. It probably melted long ago. I burned the cloth as well.”

“Smart! But you replaced Miss Jiang's key with your own. Weren't you afraid of being discovered?”

“I thought at the time that if you suspected me, it didn't matter if the key was mine or not anyway... But the day you came to the Japanese restaurant, I was still scared so I replaced...