In the short story The Lemesurier Inheritance, John Gardiner is the secretary of Hugo Lemesurier.

Gardiner is described as a tall man with a good figure and crispy curling auburn hair entered with a sheaf of papers.

Hastings at the end of the story that Hugo Lemesurier died. Thereafter Gardiner married Sadie Lemesurier, Hugo's widow. Poirot linked Gardiner's hair colour with the red hair of Sadie's son Ronald Lemesurier Jr. and speculated that there was perhaps more than met the eye.

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