Fair Margaret by F. Marion Crawford

Lushington's first discovery was not calculated to soothe his feelings. It had come about simply enough. He had bicycled in the Boulevard Pereire, keeping an eye on Logotheti's house from a distance, and had seen the motor car waiting before the door, in charge of the chauffeur. A man had come out, dressed precisely like the latter, had got in and had gone off, apparently in no hurry, while the original chauffeur went into the house, presumably to wait. It had been easy enough to keep the machine in sight till it was fairly out on the road to Versailles, after which Lushington had felt tolerably sure that by going slowly he should meet it coming back and probably bringing Margaret. As has been seen, this was what happened, and, as chance favoured him, he passed the motor before Logotheti had covered his face again. He was not likely to forget that face either, and it had done more to reveal to him his adversary's true character than any number of meetings in society.

For once he had seen the real Logotheti, as Margaret had. He had ridden on till they were out of sight and had then turned back, in no very amiable frame of mind.