Sparkling Cyanide

Sparkling Cyanide is a work of detective fiction by British writer Agatha Christie, first published in the US by Dodd, Mead and Company in February 1945 under the title of Remembered Death and in UK by the Collins Crime Club in the December of the same year under Christie's original title. The US edition retailed at $2.00 and the UK edition at eight shillings and sixpence (8/6). The novel features the recurring character of Colonel Race for his last appearance to solve the mysterious deaths of a married couple, exactly one year apart. The plot of this novel expands the plot of a short story, Yellow Iris. One year earlier on 2 November, seven people sat down to dinner at the Luxembourg restaurant. One, Rosemary Barton, never got up; instead she collapsed and died. The coroner ruled her death suicide by poisoning, due to post-flu depression. Six months later, her husband George receives anonymous letters saying that Rosemary was murdered. George investigates and decides to repeat the dinner at the same restaurant, with the same guests, plus an actress who looks like his late wife, and who is meant to arrive late and startle the murderer into making a confession. The actress does not arrive and George dies at the table, poisoned, like his wife, by cyanide in his champagne. His death might have been judged as suicide, but George shared his concerns and some of his plan with his friend Colonel Race. @Wikipedia