“Miserable little snooper,” said Henry. “You can’t open a door in that flat without finding Blackburn tiptoeing away on the other side.”

“A good many people overheard the interview,” Alleyn remarked.

“One up to you, sir,” said Henry.

“But Blackburn’s account happened to be the only one we felt inclined to believe.”

“Robin,” said Henry, “we have not distinguished ourselves, my darling. But why, Mr. Alleyn, did you reject our united;story (unhappily somewhat fanciful) in favour of a curious parlour-maid’s (probably correct)?”

“Well,” Alleyn said, “it’s a long story but the constable on duty in the drawing-room speaks French. That’s one reason.”

“Dear me! I must say we have made fools of ourselves.”

“To go on with Tinkerton. Tinkerton heard the quarrel and thought it a wonderful opportunity to secure Giggle, together with a nice fat legacy, and throw suspicion of guilt on somebody else. She and Giggle would no doubt keep their respective jobs with Lady Wutherwood. Your old nanny told Fox there was something between them. Old nannies are not always reliable witnesses but—”

“She’s right about that,” said Henry. “I remember now. There was some row about it between Uncle G. and Aunt V. He said Tinkerton was debauching Giggle. How Giggle could! Imagine it!”

“We won’t,” said Alleyn. “To continue. Michael left Giggle and took the parcel into the dining-room. The coast was clear for Tinkerton. We think she may have crossed the landing and got Giggle to come out there. She probably told him then of the quarrel. I fancy Tinkerton, like Lady Macbeth, was the brains of the party, and I may add that a casual conversation with a Shakespearian P.C. first gave me this idea. Sometime between Michael’s departure to the dining-room and Lady Charles’s return from Flat 26 the thing was concocted. Either a tentative plot was interrupted by Lord Wutherwood coming out and getting into the lift, or the whole thing took shape in Tinkerton’s fertile brain after he was there. Here was their opportunity. He was alone and he had quarrelled violently with his brother who had audibly wished him dead. They made themselves scarce while Baskett put Lord Wutherwood into his coat. As soon as Basket had gone, out they came. Giggle got his instructions. He was to go to the deserted landing below, summon the lift with Lord Wutherwood inside it, kill him, and go on downstairs. Tinkerton would recall the lift and as soon as she had touched the button hurry down after Giggle leaving all of you upstairs with a very healthy motive. All went according to plan, except that neither of them knew that injuries to the brain are not always instantly fatal. As soon as Lord Wutherwood entered the lift she gave Giggle the skewer and gloves, sent him along to get Michael as his witness, took to her old hidy-hole until Giggle had gone, and then returned to the landing. She would see the lift go down and stop at the lower landing. She would hear the doors open. Possibly she would hear another more ominous sound. She would hear the doors close again. That was her cue. She pressed the button and followed Giggle downstairs. The lift returned to the top floor and Tinkerton, having summoned it, passed it on her way down. The commissionaire saw them go out to the car, one after another, just as they said. If it seemed impossible for Giggle to have killed him then it must seem equally impossible for Tinkerton to do so since she was on Giggle’s heels. Michael provided the upstairs alibi. The pause on the second floor was sandwiched neatly between their two appearances.”