Climax! S04 E36 House of Doubt

When she loses her job, Gwen Dacres seeks economical lodgings in a boarding house run by a mysterious old woman, Mrs. Garr. Strange noises and incidents disturb Gwen's peace of mind. Gwen is attacked and Mrs. Garr disappears and is later found dead. Gwen starts to investigate and uncovers a twenty year old mystery.