The Diamond Mystery (1913) - Plot Summary Poster


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  • Jonathan Moore, who has labored for over twenty years on a formula for the making of artificial diamonds, becomes mentally unbalanced from the strain, and in this condition believes he has achieved his ambition. He writes to Bloodgood, the president of the International Diamond Syndicate in London, telling him of his invention. Bloodgood, becoming interested, cables to Rollins, the New York agent of the firm, to call upon Moore, look into the invention, but to make no definite stipulation for the purchase of it until he himself has arrived and examined it. Before Bloodgood arrives, however, Violet Moore's two suitors have become deeply interested in the invention, and one of them, Phelps Firestone, the son of a diamond merchant, realizing that if the invention is practical, his father will be ruined, appropriates the essentials of the formula and gives them to his friend, Bill, who later takes him to a counterfeiter's den, where he sells the formula for a large sum of money. With the money thus gained he is able to pay back the money which he borrowed and which he lost in betting. When the counterfeiters begin to put the formula to use they discover that it is inadequate, and send Bill to bring Phelps to them. Bill, who is entirely unaware of how Phelps gained knowledge of such a formula, is greatly surprised to learn, upon arriving at Moore's home, that Phelps has stolen the old man's ideas. Bill accuses Phelps of theft, which accusation is heard by Violet and Firestone, Phelps' father, who had come to the house to be present at the examination of the machine by Bloodgood and Rollins. Bill returns to the counterfeiters and tells them the true story. A day or two later as Violet herself was in the act of trying to make a diamond with the machine, her father, who had been sleeping on a couch nearby, tells her that he will make one for her. She watches him carefully and is astonished to observe that he places a diamond in the machine before pretending to make it. This act convinces Violet that her father's mind is deranged. That night a person dressed all in black, comes through the laboratory window and places a dynamite fuse under the machine. A moment later there is a terrible explosion and Violet, who has rushed into the room, is horrified to find that her father is missing. The next day the police learn that Moore had blown up his own machine and had been taken to the counterfeiter's den, where he had been forced to sign a paper, the contents of which he was not aware of. It was later learned that the paper was one authorizing Bill to negotiate for the purchase of the machine. Bill, Phelps and the two counterfeiters are arrested, and the shock sustained by Moore results in his regaining normal sense. Before they leave the cellar, Olin, Violet's other suitor, and who has been an apprentice to Moore, takes Violet into his arms. Mrs. Moore, who had all the time entertained an adverse opinion of her husband's invention, is glad that it is all over.


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