Young Blood by E.W. Hornung

Harry drifted through the fog, the sport of misery and rage. He was a beaten man, and slow as another to own it to himself. Now he swore that he and he alone would unravel the mystery of his father's fate; now the sense of his own impotence appalled him; but at last the bitter fact of his defeat came home to him in all its nakedness.

Yes, he had been beaten by a readier and a keener wit, and the most plausible tongue a villain ever wagged. He had been at the mercy of that specious charlatan, that unscrupulous blackleg, that scoundrel self-confessed. He knew it now. Lowndes had put him in the wrong. He was no match for a man like that. Nevertheless, he was in the right, and one day it would be proved -- and one day Lowndes would get his deserts.