The novel is narrated by Dr James Sheppard, who becomes Poirot's assistant, in place of Captain Hastings who has married and settled in the Argentine. It includes an unexpected plot twist towards the end, when Dr Sheppard reveals he has throughout been an unreliable narrator, using literary techniques to conceal his guilt without writing anything untrue (e.g., "I did what little had to be done" at the point where he slipped the dictaphone into his bag and moved the chair).
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