- 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.
- "Mark of Cain. Cain did it." These were the last words spoken by Rolan Trowbridge, a broker, who was murdered in Van Courtland Park. Kane, Trowbridge's nephew, is accused of the murder. The afternoon of the murder Kane paid his uncle a visit. As he wished to marry Alice, Trowbridge's adopted daughter, Kane asks his consent, but is refused, as his uncle wishes him to make good first. Knowing that his uncle was going to leave him $50,000, Kane asks if it is possible for him to secure the money now, as he wishes to gain control of the Burrow Stock mines. Again he is refused. Becoming angry Kane speaks: "I'll get this money, and somehow you will be sorry." That afternoon Elinore, the former housekeeper for Trowbridge, and who was to marry him, meets Kane in Van Courtland Park. A few minutes later Stryker, the faithful servant of Trowbridge, calls his master up, warning him that a trap has been set for him and to come to the park immediately. Late that afternoon Alice learns that her father has been murdered, and is comforted by Judge Hoyt. Hoyt is in love with Alice, and wishes to marry her, knowing that she is to inherit a large part of the money. He pleads with her to marry him, and as her father wished it she should do so. Alice begs him to wait a while. The next morning Kane calls to see Alice, and in the presence of Hoyt is arrested. Hoyt being a judge he questions Kane. Kane admits that he was in Van Courtland Park yesterday afternoon, at the time of the murder, and was alone. At this Elinore sinks back relieved. Hoyt orders Kane taken away. He manages to escape. The next day Alice receives a note from Kane, telling her to come and see him at once. Believing him innocent, she goes. Hoyt overhears Alice speaking to the girl who delivers the note and also follows. Kane, believing Van Courtland Park the best place, he has Alice meet him there. At the park they look for some clue. Kane notices that the ground is marked with the imprints of a cane, and comes to the conclusion that his uncle was killed by a sword cane, and that is what he meant by the Mark of Cain. They find a handkerchief. Alice immediately recognizes it as being Stryker's. To avoid suspicion Hoyt comes to Alice and begs her to let him assist her. Believing him to be sincere, Alice arranges to have Kane meet him that night at a restaurant. Hoyt tries to dope Kane through the form of sugar, but Kane becomes suspicious and throws pepper into the eyes of Hoyt and rushes out. Kane, followed by a detective, rushes to Alice's home. Explaining that Hoyt tried to dope him and that he is followed, Alice conceals him. Phoning the jewelers in Philadelphia, where Hoyt said he bought the necklace he gave her, Alice learns that Hoyt was not there on the day of the murder. Stryker enters. Kane grabs him and demands to know what he knows. He learns that Hoyt saved him from prison four years ago and forced him to aid him the day of the murder. Kane learns that Hoyt killed his uncle with a sword cane. Alice goes to Hoyt's home, followed by Kane and an officer. Alice arrives first, and is about to be killed by Hoyt when Kane arrives. Seeing Kane and the officer Hoyt rushes up the stairs to the roof. At the edge of the roof Hoyt leaps off, and a few moments later is found dead. Alice rushes into Kane's arms.
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