door and put the police on the right track. Secondly, the poison's effect on the heart couldn't be detected by post-mortem, but presented all the symptoms of status lymphaticus, enlargement of the thyroid gland and so on. As for the lock, the second turn of the key caused the needle to retire; and for a further safeguard, an almost invisible stop, resembling a small screw-head, could hold the needle permanently in place inside the lock, so that the door might be opened by a latchkey and the existence of a secret mechanism never suspected, except by one who knew how to find it. The mechanism is in working order still, ready for use again, in case Miss Grace Callender should change her mind and decide to marry." 

 "Who is it you are accusing, Lord John?" Grace stammered in a choked voice. 

 I glanced from the drooping figure in the chair to the tall figure standing erect and straight beside it. Marian Callender no longer grasped the oak carving. The hand in the ragged glove was crushed against her mouth, her lips on the emerald which had pressed through the torn suede. The woman gave no other sign of emotion than this strange gesture. 

 "I accuse Paolo Tostini, with his father, his brother, and his wife—known still as Miss Marian Callender—as his accomplices," I said. 

 Grace uttered a cry sharp with horror, yet there was neither amazement nor unbelief in the pale face which she screened with two trembling hands. The story I had told—hastily yet circumstantially—had prepared her for the end. But the keen anguish in the girl's voice snapped the last strand of Odell's patience. He threw the iron door of the safe wide open, and in two bounds was at Grace's side. I saw her hold out both arms to him. I saw him snatch her up against his breast; and then I turned to Marian Tostini, who had not moved from her place beside the big carved chair. She was staring straight at me, her dark eyes wide and unwinking as the eyes of a person hypnotised. The hand in the torn glove had dropped from her lips again and clasped the carving. She seemed to lean upon the chair, as if for support. Her fingers clutched the wood. The grey suede glove was slit now all across its back, but the snake-eye of the emerald had ceased to shoot out its green glint. The stone hung from its setting like the hinged lid of a box, showing a very small gold-lined aperture. 

 "There need be—no stain on the name of—Callender—if you are as clever in hiding the secret as you've been—in finding it out," she said, with a catch in her breath between 

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