Judith Westall, having learned that her deceased friend suspected her cousin Garth Seaton of a terrible crime, goes to his castle under the guise of a governess in order to investigate this sinister case. Soon the countess arrives at the castle and, without hiding her intentions, she wants to marry Garth. At first she does not pay attention to the governess, but, noticing that Garth is showing interest in the girl, she begins to threaten her...