He came down the room, kissed Germaine's hands, shook hands with the millionaire, and bade them good-night.

Then he went out to the car.

They heard it start; the rattle of it grew fainter and fainter down the long avenue and died away.
M.Gournay-Martin arose, and began putting out lamps.

As he did so, he kept casting fearful glances at the window, as if he feared lest, now that the Duke had gone, the burglars should dash in upon him.
There came a knock at the door, and Jean appeared on the threshold.
"His Grace told me that I was to come into the house, and help Firmin look after it," he said.
The millionaire gave him instructions about the guarding of the house.
Firmin, since he was an old soldier, was to occupy the post of honour, and guard the hall, armed with his gun.

Jean was to guard the two drawing-rooms, as being less likely points of attack.