First, my usual quibbles: Why did it take three editors to compile 14 stories by one author? Why do they not grant Doyle the courtesy of his title? I currently have three other books by Doyle in my collection; all of them properly give his byline as "Sir Arthur Conan Doyle."
That aside, in general I can say that these are not the author's best stories. This volume is probably more for the Doyle aficionado or completist. However, there are a couple of hidden gems.
"The Captain of the Polestar" * One star. A generic ghost story with little to recommend it. I don't know why the editors chose to lead off with this one, because it is the weakest of the lot. The setting--a whaling ship trapped in arctic ice with a captain who has apparently lost his mind--would seem to be a promising one for a horror story, but Doyle fails to take advantage. He does himself no favors by framing the story as journal entries by the ship's doctor.
"The Case of Lady Sannox" ** Two-and-a-half stars. The "case" of the title refers to a medical consultation; it is not a mystery story. I've never been a fan of stories in which husbands or wives take gruesome revenge on their cheating spouses, but this one is at least well-written.
"The Fiend of the Cooperage" ** Two stars. An African monster story.
"The Horror of the Heights" * One-and-a-half stars. Again, the device of writing the story as a series of journal entries handicaps the action.
"J. Habakuk Jephson's Statement" No rating. Although this is an effective piece of fiction, I cannot render a positive review because it plays on white paranoia of a race war. Racial tropes from 1884 are (or should be) offensive to the modern reader. This is early Doyle. Thankfully, he went on to bigger and better things (something about a consulting detective, I think).
"John Barrington Cowles" *** Three stars. An unusual, and creepy, departure for Doyle.
"The Leather Funnel" & "The Lift" *** Three-and-a-half stars each. Doyle's talents are on display here: He draws memorable characters with a few deft strokes (including two very menacing villains), plunges the reader into a situation of intense danger, and then resolves everything at a breakneck pace. I compare these two to a Nilla wafer--an insubstantial treat, leaving you wanting more.
"Lot No. 249" ***** Five stars. Easily the best story in the collection, as well as the longest, at 40 pages. I have always felt that Doyle's short fictions were better than his novels, and perhaps the novelette format was the best fit for him. Here he develops several memorable characters, creates tension, and sets the action in a unique venue (student life in Victorian-era Oxford University). From what I have read elsewhere, we can thank (or blame) "Lot No. 249" for the later prevalence of evil mummies in stories and film. I have never been a fan of the mummy/zombie genre myself, but this one is very well done.
"The New Catacomb" * One star. Doyle must have been reading "The Cask of Amontillado" and thought "I could do that!" Except he couldn't--at least, not very well.
"The Silver Hatchet" ** Two stars. Another early story by Doyle, and it shows.
"The Striped Chest" **** Four stars. Here Doyle does what he failed to do in "The Captain of the Polestar": He uses his shipboard experience to good effect. Also, he abandons his habit of writing his stories as journal entries. I think it is no coincidence that the best stories in this collection do NOT use that device.
"The Terror of Blue John Gap" ** Two stars. A likely premise--that of a subterranean Lost World--is wasted with, again, a series of journal entries. No memorable characters are developed here, and the "Terror" turns out to be a laughable anticlimax. I was pleasantly surprised to discover that Blue John is an actual semi-precious stone known from ancient times, and thus the device of an abandoned Roman-era mineshaft (the "Gap" of the title) was a very plausible thing. I wish he had done better with this one, because I really wanted to like it.