The Absence of Mr. Glass (The Father Brown Classics, Episode 13)

The Absence of Mr Glass: "But What about the two voices?" asked Maggie, staring. - "Have you never heard a ventriloquist?" asked Father Brown. "Don't you know they speak first in their natural voice, and then answer themselves in just that shrill, squeaky, unnatural voice that you heard?" - There was a long silence, and Dr Hood regarded the little man who had spoken with a dark and attentive smile. "You are certainly a very ingenious person," he said; "it could not have been done better in a book. But there is just one part of Mr Glass you have not succeeded in explaining away, and that is his name. Miss MacNab distinctly heard him so addressed by Mr Todhunter."