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The tale unfolds as Captain Hastings, injured in the First World War, receives an invitation from his old friend John Cavendish to spend his sick leave at the enchanting Styles Court in England. Amidst the serene surroundings, Hastings encounters John's step-mother, Mrs. Inglethorp, and her recently-wedded husband, Alfred, setting the stage for a seemingly idyllic respite.

However, a disquieting realization dawns upon Hastings as he senses an underlying unease within the tranquil estate. The tranquility shatters when Mrs. Inglethorp is discovered poisoned, casting suspicion upon the family members, prompting the need for a thorough investigation.

In a twist of fate, another old friend, the renowned detective Hercule Poirot, is called upon to unravel the web of secrets and deceit surrounding the mysterious poisoning at Styles Court and the classic whodunnit ensues.