Margaretta Scott is "A Woman Possessed" in this 1958 film, also starring Francis Matthews, Kay Callard, and Ian Fleming.
Scott is Katharine, a widow whose son John (Francis Matthews) has been away at medical school and comes home after being away for a time. Katharine is terribly excited, as is her maid, who has known the boy since childhood, until John walks in with a fiancée, Ann (Callard). Katharine doesn't take kindly to the fact that her beloved son is getting married, nor does she take kindly to the fact that after the wedding, he will set up practice somewhere other than in the next room.
Katharine immediately starts her dominating influence on John, telling him that she has called in architects to turn part of the house into a surgery for him, and using Ann's heart condition as a reason why Ann shouldn't be alone while he's working. John obviously has never stood up to her, and Ann realizes there's a problem right away. The question is, will poor Ann make it to the wedding? Despite protestations of innocence, Katharine seems determined to break them up.
The big problem with this film is that before each scene, I knew exactly, right down to the dialogue, what was going to happen next. As far as the twist at the end, I knew that too, and did not consider it any twist.
This movie was edited poorly as well, since there is a reference to something dangerous in the house that never is mentioned again. Obviously a scene or scenes were cut.
The acting was fine, with Ian Fleming as Katharine's wise brother giving very good support.