The Bishop's Secret by Fergus Hume

'A private inquiry agent! ' Sir Harry jumped up from his chair with an angry look, and a sharp ejaculation, neither of which disturbed his visitor. With his red bandanna handkerchief spread on his knees, and his straw hat resting on the handkerchief, Baltic looked at his flushed host calmly and solemnly without moving a muscle, or even winking an eye. Brace did not know whether to treat the ex-sailor as a madman or as an impudent impostor. The situation was almost embarrassing.

'What do you mean, sir,' he asked angrily, 'by coming to me with a cock-and-bull story about your conversion, and then telling me that you are a private inquiry agent, which is little less than a spy?'