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The Mark of Cain Synopsis

After old Trowbridge is mysteriously murdered, his nephew, Kane Langdon, is accused of the crime. Trowbridge's adopted daughter Alice makes every effort to prove Kane's innocence, but to no avail. When Kane escapes from the clutches of the law, Alice works with him to investigate the crime. They soon discover that Judge Hoyt, a great friend of Trowbridge and an ardent admirer of Alice, killed Trowbridge after forging the old man's will to read that Alice would only inherit his fortune if she married the judge. The judge, confronted with the accusation, becomes so unnerved that he confesses to the crime, and all ends happily with Alice in Kane's arms.

Via Wireless Synopsis

Marsh, a draughtsman in the gun factory of John Durant, is swindled by Edward Pinkney, Durant's general manager, out of the huge royalty to be paid should a gun of Marsh's invention prove a success. Pinkney loves Maisie, but is far outrivaled by Lieut. Somers, U.S.N. Somers also has invented a gun which he gives to be cast by the Durant Iron Works, and which, if successful, will do Pinkney out of his expected graft on the Marsh invention. Pinkney takes good care that the Somers gun is "killed" in the making. He then misrepresents Somers to Maisie and her father, and though Maisie loves the Lieutenant, she feels she must give him up. Accompanied by her mother and Pinkney, she goes in the Durant yacht for a cruise in Turkish waters, formally engaging herself to Pinkney. The Durant yacht hits a mine, and in the rush to leave her, Maisie is trapped in the wireless room. With the water surging up about her shoulders, and every means of escape barred she sends out the S.O.S. signal taught her by Lieut. Somers. The lieutenant, aboard a U.S. cruiser, protecting American interests in Turkey, gets the signal, and arrives at the side of the doomed ship just in time to make a sensational rescue. Here follow a mass of complications as the plot gradually resolves itself to its end.