The Red Track by Gustave Aimard

Directly on emerging from the Paseo, the two men separated, as had been agreed on between them; that is to say, the capataz went ahead, followed at a respectful distance by Martial the Tigrero, whom the reader has doubtless recognized.

All happened as the capataz had announced. The streets were deserted, the horsemen only met a few half sleeping serenos leaning against the walls, and were only crossed by a patrol of celadores walking with a hurried step, and who seemed more inclined to avoid them, than to try and discover the motives that caused them thus to ride about the streets of the capital at night, in defiance of the law.