The Inheritance (1947)

Caroline Ruthyn is the teen-aged niece of the her uncle Silas, a sickly and at one time unbalanced man who becomes her guardian on the death of her father. The fact that Silas is broke and greedy and young Caroline is the heir to her father's great fortune is reason enough for Caroline to be wary, but her fears escalate after she meets Silas's perverted son and she discovers that her fearsome former governess, Madame de la Rougierre, is in league with her uncle.