Given the question: Given the following context:  A seemingly kind painter, Henry Elcott, tricks wealthy art collector Mary Herries into letting him, his wife Ada and their baby live in her London home. Ada has collapsed and a doctor claims it is best she not be moved. It turns out to be a diabolical scheme by Elcott to sell off the artwork of Mrs. Herries and everything else of value she owns while holding her and her housemaid Rose captive in their bedrooms. Elcott's accomplices, Mr. and Mrs. Edwards, take over as the butler and maid. Elcott masquerades as the lady's nephew, come to take care of her affairs due to a sudden mental breakdown. The criminals taunt Mrs. Herries, placing her chair near a window, having informed the neighborhood that any screams they hear would be those of a woman who has gone mad. In no hurry to leave, Elcott goes so far as to paint a portrait of her. Mrs. Edwards gets anxious that they are staying too long in the house, which Elcott intends to sell. Mrs. Herries tries to bribe her, but the brutal Mr. Edwards snatches the money from his wife and refuses to leave. Tensions rise as Mrs. Herries learns the true identity of Elcott from a portrait of his wife that he signed with his real name. Ada has seen Elcott kill before and realizes he will again. She tries to free Rose, but the maid is murdered by Mr. Edwards. The time comes to pack up and leave. Mr. Edwards goes upstairs to push Mrs. Herries out the window, an apparent suicide. But the body in the chair has been switched by Mrs. Herries and Ada and is actually that of Rose. The police are on their way and Elcott realizes that he and Mr. and Mrs. Edwards have made a fatal mistake.  answer the following question:  Who tries to free the housemaid?
The answer is:
Ada