Pimpernel and Rosemary by Emma Orczy

Rosemary was the first to remember that time was slipping by. She looked at her watch. It was past ten o'clock--over an hour since Peter had asked her to try to forget. She rose briskly to her feet, and arm in arm, like two good comrades, she and Jasper made their way together towards the château. When they came in sight of the great gates-a couple of hundred yards still ahead of them--Rosemary was the first to spy a motor-car standing there, and some half-dozen persons in the act of getting into the car. There were two sentries at the gates, and seemingly a few people on the other side.

"It looks like a man and a woman and three soldiers in uniform getting into that car," Rosemary remarked casually. And immediately, for no apparent reason, Jasper started to walk along more rapidly; a few seconds later he almost broke into a run. At that moment the car started off, and was soon lost to sight in a cloud of dust. Rosemary thought that she heard Jasper utter a savage oath.