Mrs. Protheroe took no handbag with her. Really a most unusual thing for a woman to do. Just before twenty past six she passes my garden and stops and speaks, so as to give me every opportunity of noticing that she has no weapon with her and also that she is quite her normal self. They realized, you see, that I am a noticing kind of person. She disappears round the corner of the house to the study window. The poor colonel is sitting at the desk writing his letter to you. He is deaf, as we all know. She takes the pistol from the bowl where it is waiting for her, comes up behind him and shoots him through the head, throws down the pistol and is out again like a flash, and going down the garden to the studio. Nearly anyone would swear that there couldn’t have been time!”
“But the shot?” objected the colonel. “You didn’t hear the shot?”
“There is, I believe, an invention called a Maxim silencer. So I gather from detective stories. I wonder if, possibly, the sneeze that the maid, Clara, heard might have actually been the shot? But no matter. Mrs. Protheroe is met at the studio by Mr. Redding. They go in together—and, human nature being what it is, I’m afraid they realize that I shan’t leave the garden till they come out again!” I had never liked Miss Marple better than at this moment, with her humorous perception of her own weakness. “When they do come out, their demeanour is gay and natural. And there, in reality, they made a mistake. Because if they had really said goodbye to each other, as they pretended, they would have looked very different. But you see, that was their weak point. They simply dare not appear upset in any way. For the next ten minutes they are careful to provide themselves with what is called an alibi, I believe. Finally Mr. Redding goes to the Vicarage, leaving it as late as he dares. He probably saw you on the footpath from far away and was able to time matters nicely. He picks up the pistol and the silencer, leaves the forged letter with the time on it written in a different ink and apparently in a different handwriting. When the forgery is discovered it will look like a clumsy attempt to incriminate Anne Protheroe.