Sparkling Cyanide by Agatha Christie
I love the title Sparkling Cyanide. Christie's titles don't tend to be particularly noticeable, but Sparkling Cyanide stands out. It captures clearly the method of murder - cyanide in the champagne, and it's a bit glamorous.
Rosemarie died a year ago, presumably suicide. She was a beautiful woman, but her death benefitted several people. Her husband, George, truly loved her, in spite of her affairs, and has come to believe that she was actually murdered. Any one who was at the dinner the night she died could have done it - her lover or his scorned wife, her sister Iris who stands to inherit, the husband's trusted secretary, or a rather shady "friend" who, a year later is making moves on Iris. George organizes a second dinner party, with the same people, hoping to force a confession. It all goes terribly wrong when George is killed too.
Colonel Race, a friend of George's, helps in the investigation. He doesn't actually do much, but he is on...