Lady Black is depressed

Margo Lonsdale, the wife of a successful businessman, stabs her husband to death one day. All of her evidence was hidden, and she even framed a male servant. No one would think that Margo is the murderer, to them, she is the quietest and most docile woman in the world. However, Margo is stranded in her mansion along with her mourners due to a snowstorm that began after the funeral. To make matters worse, her sister-in-law's gloomy maid 'Peggy' discovers evidence of her murder....