Edward(Jack Ging)wants to murder his own severely depressed sister Amanda(Edith Atwater)to get his inheritance.He hires a discredited ex-nurse Esthe(Antoinette Bower)to control Amanda's suicidal tendencies.Esther doesn't want to kill the old woman, though and she is curious about the secrets held in the house including a mysterious third sister Nell."Die Sister,Die!" is relentlessly talky and rather subtle Gothic thriller from early 70's.There is pretty gruesome and grotesque nightmare sequence and two suicide attempts,though.The script is quite surprising and the acting is solid.6 basement walls out of 10.If you liked French "Diabolique" from 1955 give this one a chance.
Review of Die Sister, Die!
