"She's been awfully unstrung ever since Nita's murder," Penny defended her friend. "She told us all Monday night at Peter's that the doctor had prescribed sleeping medicine.... Now, you look here, Bonnie Dundee!" she cried out sharply, answering an enigmatic smile on the detective's face, "if you think Flora Miles killed Nita Selim and Dexter Sprague, because she was in love with Dexter and learned he was Nita's lover from that silly note----"
"Whoa, Penny!" Dundee checked her. "I'm not linking exactly that. But I've just remembered something that had seemed of no importance to me before."
"And what's that, Mr. Smart Aleck?" Penny demanded furiously.
"Before I answer that question, will you let me do a little theorizing?" Dundee suggested gently. "Let us suppose that Flora Miles was _not_ in love with Sprague, but that she was being blackmailed by Nita for some scandal Nita had heard gossiped about at the Forsyte School.... No, wait!... Let us suppose further that Nita recognized Flora's picture in the group Lois Dunlap showed her, as the portrait of the girl whose story she had heard; that she was able, somehow, to secure incriminating evidence of some sort--letters, let us say. Nita tells Sprague about it, and Sprague advises her to blackmail Flora, who, Lois has told Nita, is very rich. So Nita comes to Hamilton and bleeds Flora of $10,000. Not satisfied, Nita makes another demand, the money to be paid to her the day of the bridge luncheon----"
"Silly!" Penny scoffed furiously. "The only evidence you have against poor Flora is that she stole the note Dexter had written to Nita!"
"That's the crux of the matter, Penny darling!" Dundee assured her in a maddeningly soothing voice, at which Penny clinched her hands in impotent rage. "Flora, seeing Nita receive a letter written on her husband's business stationery, jumps to the conclusion that Nita had carried out her threat to tell Tracey, or that Nita has at least given Tracey a hint of the truth and that Tracey's special-messenger note is, let us say, a confirmation of an appointment suggested by Nita.... Very well! Flora goes to Nita's bedroom at the first opportunity, knowing that Nita will come there to make up for the men's arrival. Let's suppose Flora had brought the gun and silencer with her, intending to frighten Nita, rather than kill her. But having had proof, as she believes, that Nita means business, Flora waits in the closet until Nita comes in and sits down at her dressing-table, then steps out and shoots her. Then she recoils step by step, until her foot catches in the slack cord of the bronze lamp, causing the very 'bang or bump' which Flora herself describes later, for fear someone else has heard it. Her first concern, of course, is to hide the gun and silencer. She remembers Judge Marshall's tale of the secret shelf in the guest closet, and not only hides the gun there but seeks in vain for the incriminating evidence Nita has against her. But she also remembers the note she believes Tracey has written to Nita, and which, if found after Nita's death, may give her away. So she goes to the closet in Nita's bedroom, finds the note, and faints with horror at her perhaps needless crime when she realizes that the note was written by Sprague, and not Tracey. Of course she is too ill and panic-stricken to leave the closet until the murder is discovered----"