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 body up in a rug and put it on the seat in the adjoining compartment amongst the bags and suitcases. Knighton drops off the train, taking the jewel-case containing the rubies with him. Since the crime is not supposed to have been committed until nearly twelve hours later he is perfectly safe, and his evidence and the supposed Mrs. Ketterings' words to the conductor will provide a perfect alibi for his accomplice.

"At the Gare de Lyon Ada Mason gets a dinner basket, and shutting herself into the toilet compartment she quickly changes into her mistress's clothes, adjusts two false bunches of auburn curls, and generally makes up to resemble her as closely as possible. When the conductor comes to make up the bed, she tells him the prepared story about having left her maid behind in Pans; and whilst he is making up the berth, she stands looking out of the window, so that her back is towards the corridor and people passing along there. That was a wise precaution, because, as we know, Miss Grey was one of those passing, and she among others, was willing to swear that Mrs. Kettering was still alive at that hour."

"Go on," said Van Aldin.

"Before getting to Lyons, Ada Mason arranged her mistress's body in the bunk, folded up the dead woman's clothes neatly on the end of it, and herself changed into a man's clothes and prepared to leave the train. When Derek Kettering entered his wife's compartment, and, as he thought, saw her asleep in her berth, the scene had been set, and Ada Mason was hidden in the next compartment waiting for the moment to leave the train unobserved. As soon as the conductor had swung himself down on to the platform at Lyons, she follows, slouch