The Rebel Chief by Gustave Aimard

Don Melchior de la Cruz resolved to seize at any price the fortune of his father, which his sister's marriage threatened to make him hopelessly lose, had rushed headlong into politics, hoping to find amid the failures which had so long distracted his country, the occasion to satisfy his ambition and insatiable avarice by fishing largely in the troubled waters of revolutions.

Endowed with an energetic character and great intelligence, a true political condottiere, passing without hesitation or remorse from one party to another, according to the advantages offered him, ever ready to serve the man who paid him best, he had contrived to render himself master of important secrets which made him feared by all, and gained him a certain degree of credit with the chiefs of parties whom he had served in turn; a well-born spy he had managed to get in everywhere, and join all the fraternities and secret societies, for he possessed in a most eminent degree the talent so envied by the most renowned diplomatists, of naturally feigning the most opposite feelings and opinions. It was thus that he became a member of the mysterious society Union and Strength, by which he was eventually condemned to death, with the predetermined resolution of selling the secrets of this formidable association whenever a favourable opportunity presented itself.