Sparkling Cyanide

When Rosemary Barton dies from drinking a cyanide-laced glass of champagne at her own birthday party, the coroner's verdict is suicide, but her husband suspects murder. In an effort to trap the murderer, her husband calls the original group together again on the anniversary of Rosemary's death. There, another in the group keels over dead, again the victim of cyanide in the champagne.