This looks like it was made by cobbling together all those Classic British Mystery elements, as engineer and amateur sleuth John Stuart heads over to a Country Home populated with some good actors -- Evelyn Ankers, Annie Esme, Finlay Curie and, further down the cast list, Ian Fleming, Wilfred Hyde-White and John Laurie.
As you can tell from that list, it's got a cast who are willing to tell Stuart the important clue, but first they all need to get a good night's sleep; or decide to tell him whodunnit, , and just as they announce their intention to do so, they are shot; the Suspicious Suspect; and the legend of a treasure to drag like a red herring across the path to the solution. After they drag off the guilty guy, some one explains most of what happened and leaves before he finishes.
The performances are fine, as you would expect with a cast like that, but you get to see why people considered Agatha Christie a good writer for decades.
As you can tell from that list, it's got a cast who are willing to tell Stuart the important clue, but first they all need to get a good night's sleep; or decide to tell him whodunnit, , and just as they announce their intention to do so, they are shot; the Suspicious Suspect; and the legend of a treasure to drag like a red herring across the path to the solution. After they drag off the guilty guy, some one explains most of what happened and leaves before he finishes.
The performances are fine, as you would expect with a cast like that, but you get to see why people considered Agatha Christie a good writer for decades.