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Taken at the Flood - Agatha Christie

The hands tightened round her neck, the room whirled, blackness, spinning blackness, suffocation— everything going dark… And then, suddenly a cough. A prim, slightly artificial cough. [...]

Just inside the door, Hercule Poirot stood apologetically coughing.

‘I hope,’ he said, ‘that I do not intrude? I knocked. Yes, indeed, I knocked, but no one answered… I suppose you were busy?’

WTF, Poirot??

 

[quote redacted to avoid spoilers]