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One morning Ira Leavenworth (William Walcott) doesn't appear for breakfast so his two nieces, Eleanor (Seena Owen) and Mary (Martha Mansfield), and his secretary, Harlwell (Paul Doucet) try to find him. The old man is discovered shot to death in his sound-proof study. Suspicion falls on Eleanor, but Raymond (Bradley Barker), Leavenworth's attorney, is in love with her and he is determined to help her out. He asks the district attorney to hold off from arresting her until he can investigate with the help of a famed private detective. A mysterious visitor (Wilfred Lytell) also becomes a suspect, and finally everyone involved with the dead man is lured to "the Rat Trap." Through wit and strategy, Harlwell -- who was secretly in love with Mary -- is forced to confess that he is the killer, and Eleanor is cleared.