In the story "The Glasgow Mystery," how does the author feel about the main characters telling the story and where is the mystery solved?

The story “The Glasgow Mystery” is taken from a book of 12 mysteries called “The Old Man in The Corner,” republished in 1980.  The original anthology had more than 12 short stories and this specific story was not included. These stories were written by Baroness Orczy and were considered to be the “of the armchair detective” mysteries. The old man, Bill Owen, “an extremely eccentric man who spends much of his time in a restaurant, the A.B.C. Shop, working untiringly at tying and untying knots in a piece of string. “  The author seems to really appreciate this character.  She has created him to seem “ ageless and apparently unchanging” “ Not much concerned with justice or morality, he is interested in crime “only when it resembles a clever game of chess, with many intricate moves which all tend to one solution, the checkmating of the antagonist—the detective force of the country.” Like all amateur sleuths, the old man has his Watson, a female journalist by the name of Polly Burton. An invariably baffled reader of stories of mysterious deaths in the newspapers, she comes to the A.B.C. Shop to hear the old man unravel the mystery.”