Mr. Marx's Secret by E. Phillips Oppenheim

In less than a week's time I was master of the state of affairs at Borden Tower. Dr. Randall, with the best possible intentions, was the worst possible man that could have been chosen for the guardianship of two such pupils as Lord Silchester and Leonard de Cartienne. He was a scholar and a pedant, utterly unsuspicious and ignorant of the ways of the world, himself so truthful and honourable that he could scarcely have imagined deceit possible in others, and certainly not in his own wards. Of the servants, James and his wife were the only ones in authority, and they were the tools of de Cartienne.

The latter I could not quite understand. The only thing about him perfectly clear was that he was just the worst companion possible for Silchester. For the rest, he was so clever that his presence here at all as a pupil seemed unnecessary. He appeared to be rich and he took a deep interest of some sort in Cecil. Seemingly it was a friendly interest, but of that I did not feel assured. At any rate, it was an injurious association for Cecil, and I determined to do everything in my power to counteract it.