On the afternoon of 10 November, ninety-year-old General Fentiman is called to the deathbed of his estranged sister, Lady Dormer, and learns that under the terms of her will he stands to inherit most of her substantial fortune – money sorely needed by his grandsons Robert and George Fentiman. However, should the General die first, nearly everything will go to Lady Dormer's companion, Ann Dorland.
Lady Dormer dies the next morning, Armistice Day,  and that afternoon the General is found dead in his armchair at the Bellona Club. Dr Penberthy, a club member and the General's personal physician, certifies death by natural causes but is unable to state the exact time of death. As the estate would amply provide for all three claimants, and as it is unknown whether the General or his sister died first, the Fentiman brothers suggest a negotiated settlement with Ann Dorland, but she surprisingly and vehemently refuses. Wimsey is asked to investigate.
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The Unpleasantness at the Bellona Club - Wikipedia