Brave Old Salt by Oliver Optic

Lieutenant Pillgrim rattled off the sentences in which he acknowledged his complicity with treason with a smile of malignant triumph on his face. He gloated over his victim as the evil one might be supposed to do over a soul wrenched from truth and virtue. He believed that he had Somers in a position where he could not betray him, or even resent his tyranny.

For the first time Somers realized that he had been imprudent in exposing himself to the machinations of these evil men. Before he had only felt a little uncomfortably, and harbored a vague suspicion that, in attempting to overreach others, he had committed himself. He had learned in his babyhood that it is dangerous to play with fire, but had never believed it so fully as at this moment. He had touched the pitch, and felt that he had been defiled by it. Though his conscience kept assuring him he was innocent, and protesting against a harsh judgment, he could not help regretting that he had not exposed the villains before he left Philadelphia, and permitted the consequences to take care of themselves.