“The Duchess was always of the greatest assistance to his hobby of criminal investigation, though she never alluded to it, and maintained a polite fiction of its non-existence.”
Sayers, Dorothy L. Mineola: Dover Publications, 1923. Print
Note: Refers to his own mother as “the duchess” distanced relationship, doesn’t really care about it/him? What is she really thinking? Is she just a busy-body or does she have ulterior motives?