Poirot finds a frozen leg of mutton which interests him very much. Poirot hypothesizes that the murderer was a young man who came in a trap, killed Whalley, and went away. His clothing was slightly bloodstained. Poirot talks to Grant and asks him whether he entered the room twice to take the jade figures. When he replies in the negative, Poirot reveals that no one noticed the murderer because he came in a butcher's cart. Mutton is not delivered on Sundays and if it had been delivered on Saturday it would not have been frozen. The man who gave Grant this job, Poirot assumes, was Number 4.