Alterations to the text:
Abandon the use of drop-caps.
Adjust some quotation mark pairings/nestings.
Capitalize several instances of doctor and superintendent when used in direct addresses.
Change “That may have been lapis luzuli, but more probably” to lazuli.
“As any rate, it is an heirloom, and I am loath to lose it” to At.
(“Here is the Blowgraves’ place,” said Thorndyke. “nearly in the…”) change the period to a comma.
(“I think so, excepting that I learn from Foxton that…”) to learned.
“we reached a rather dark first-door landing where” to floor.
“Now what West Central place names end in ‘n.’ It was not a street…” change the period to a question mark.
(“who would successfully practise the scientific detection…”) to practice.
“a small telescopic jemmy, a jointed augur, a screwdriver and…” to auger.
(“He must be pretty tough. Shall we be able to see him.”) change the second period to a question mark.
“He continued to advance at any easy pace, and I noticed that” to an.
“And there’s something queer agoing on aboard of her” to a-going.
(“This’ll do your trick, master. Here comes a Customs cruiser.”) to mister.
“Who is to contest his family’s claim.” change the period to a question mark.
The Blue Scarab · The Wunder Library — complete classics, free to read, with narration.