"Oh, but you can."
"No, I am bound by an oath; I cannot break my oath."
The detective meditated and then asked:
"Do you know that Donetti is in New York?"
"I do not."
"Have you reason to suspect that he is?"
"I had no reason to so suspect until you indicated that he was possibly the author of the warning note, then I did suspect that he was in New York."
"Have you any grounds for believing that he is a criminal?"
"I have not."
"Then why do you fear he may be with the robbers to-night?"