she was the murderer; the police have so focused on David's alibi that they subjected hers to little scrutiny. Lynn tells Rowley that she wishes to marry David Hunter. Rowley is strangling Lynn when Poirot stops him. David arrives and Poirot explains everything. Rowley visited Arden, and seeing the physical resemblance to Frances, reacted angrily to the deception that was being played. Pushed by Rowley, Arden fell against the mantelpiece and died. Rowley saw the opportunity to incriminate David. He smashed in Arden's head with fire tongs and left David's lighter at the scene. It was Rowley who persuaded Porter to give the false identification, carefully employing Poirot, who would be sure to go to Porter on the basis of that first scene at the club, which Rowley also knew of from Jeremy. Porter's guilt got the better of him and he committed suicide, leaving a note that Rowley destroyed. Discovering Arden's body, David ran for the 9:20 train
As the conspiracy reached a crescendo of preparation in the middle of July, he was sometimes reading two or more in a day: two letters from the queen bear notations "decifred 18 July 1586," two others are marked as deciphered July 21, and there are still other cipher letters in the same packet in the records that bear no notations. During these three months, Walsingham cannily made no arrests, but simply let the plot develop and the correspondence accumulate in the hope that Mary would incriminate herself. His expectations were fulfilled. Early in July, Babington specified the details of the plan in a letter to Mary, referring to the Spanish invasion, her own deliverance, and "the dispatch of the usurping competitor." Mary considered her reply for a week and, after composing it carefully, had Curll encipher it; she sent it off to Babington on July 17. It was to prove fatal, for in it Mary acknowledged "this enterprise" and advised Babington of ways "to bring it to good success
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