Candles at Nine (1944), 6- {nm}

A rich but miserly old man taunts his relatives about who will get his money when he dies, and is soon mysteriously murdered. It turns out that he has left his estate to a beautiful young ... 
1h 15min | Mystery
Director: John Harlow
Stars: Jessie Matthews, Eliot Makeham, Beatrix Lehmann, John Salew

https://www.imdb.com/title/tt0036694/
print is public domain (lack of) quality: overly dark, fuzzy.

The credits are strange: on the card preceding the title card, JM is listed first. But a few cards later they have the full cast, where she is listed 10th.

JM is the reason I own this. Although it's not a musical, our introduction to her is as a performer (amateur?), singing and then dancing with a man on stage. The pair of men-cousins also sings something later at the estate, although it's not in the Soundtracks.

The only mention of the war was the requirement of ration coupons for buying new clothes and the enforcement of blackout conditions at night.

The only Mystery here is whether the butler & housemistress will manage to bump off the heiress (JM), and why are they trying. They would not profit; according to the will, if JM doesn't satisfy the conditions of inheritance, the remaining relatives will have to "work it out among them." That seems to leave out the staff. If they didn't know that before the deceased met with his "accident", they certainly did after the reading of the will. Ah, the former cop just explained that the housemistress was secretly married to the deceased, who years earlier had killed his brother to inherit the estate.

The film ends rather abruptly, after the former cop's explanation, and JM's thwarting the housemistress' latest attempt to dispose of her. No real resolution, since, as the cop says, he has no proof of his conjectures. But it was an ok film, based mostly on JM's presence.

JM makes only 2 more movies: Tom Thumb ('58), and a Peter Cook/Dudley Moore Sherlock Holmes film in '78.

British National Films, dir. Harlow; 6-