"And yet there's one person quite near at hand who in all probability knows where he is, or at all events where he is likely to be."
"Who is that?" asked Tuppence, puzzled.
"Mrs. Vandemeyer."
"Yes, but she'd never tell us."
"Ah, that is where I come in. I think it quite likely that I shall be able to make Mrs. Vandemeyer tell me what I want to know."