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In the short story The Terrible Catastrophe, (later chapter 15 of The Big Four), Dr Treves is the doctor of the elderly Mr Templeton. Mr Templeton had repeated bouts of gastric attacks with vomiting and pain. Treves believed it was quite normal but Templeton's Nurse Mabel Palmer believed he was being poisoned. She told Poirot that she had seen Treves with Mrs Templeton in the garden together.

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