Yes, she had, she said.

She heard the gentlemen leave the sitting-room upstairs and say good-night to each other as they went to their bedrooms, and she turned off the gas at the meter underneath the stair five minutes afterwards, when she had finished her ironing, and went to bed herself.

That would be about half-past ten.
Mr.Cromering, who did not understand the purport of the question, was satisfied with the answer, and allowed the servant to retire.

But Colwyn, as he went out to the front to get the motor ready for the journey to Heathfield, was of a different opinion.
"Ann may have turned off the gas as she said," he thought, "but it was turned on again during the night.

Did Ann know this, and keep it back, or was it turned on and off again without her knowledge ?".