Do you have a link? What is it, a collection of short stories by Arthur Conan Doyle or by other authors?
If it's the canonical short stories, I recommend you get one with the original illustrations, like this one
Many of them, at least, I don't know if all.
Search Wodehouse Gutenberg in whatever search engine you like, that should find you his author's page on Project Gutenberg, which offers legally free ebooks in many formats.
https://www.gutenberg.org/ebooks/author/783
If you want it only on Kindle, search there, in among the paid versions there are free ones, and the filter button on amazon search results lets you sort by increasing price, which brings the free ones to the beginning.
e.g. https://www.amazon.com/P-G-Wodehouse-Collection-ebook/dp/B07H5355P8/
check out:
Raymond Chandler (The Big Sleep, The Long Goodbye)
Dashiell Hammett (The Maltese Falcon, the Glass Key)
Jim Thompson (The Killer Inside Me, the Getaway)
Ross Macdonald (The Chill, The Doomsters, The Dalton Case)
Patricia Highsmith (The Talented Mister Ripley)
Lawrence Block (Eight Million Ways to Die, A Long Line of Dead Men)
Dorothy L. Hughes (A Lonely Place)
there's a great noir story anthology edited by James Ellroy and Otto Penzler https://www.amazon.com/Best-American-Noir-Century-®/dp/0547577443
I'd say Peter Straub’s Koko very successfully mixes many of the trappings of hardboiled detective fiction with very potent psych horror.
EDIT: And, while it's not specifically hardboiled detective, I have a really nice short story collection called Shadows Over Baker Street which mixes Sherlock Holmes and the Cthulhu Mythos. In fact, I've read quite a few horrific and straight-up horror Holmes pastiches over the years including Fred Saberhagen's The Holmes Dracula File, Loren Estleman's Sherlock Holmes Vs Dracula, Edward Hanna's The Whitechapel Horrors, Gaslight Grimoire, J.R. Campbell and Charles Prepolec (ed), etc..
There is an entire anthology of Holmes / Lovecraft cross over stories,
I love Neal Gaiman but I actually thought a Study In Emerald was one of the weaker stories in the collection.
I know this isn't the complete set, but I started with The Original Illustrated Sherlock Holmes which has the original copies from The Strand magazine of 37 stories and the Hound of the Baskervilles. These include all the original illustrations by Sidney Paget. I've only had to buy a couple other books to finish my collection after buying this one and it's still my favorite go to Sherlock book.
https://www.amazon.com/Original-Illustrated-Sherlock-Holmes/dp/0890090572
Bought it from the Amazon Kindle store - publication date there listed as August 29, 2020. I do keep the publication date rule in mind when I post excerpts!
Noted on the exposition for sharing, I was worried my previous ones were too long-winded so I tried for brevity here.
I can only echo what NewLondon6 said, but I would recommend you check out the original books if you ever have the chance. They're good and short (about 100 pages each). I would recommend you start with the short story collections, simply because they're more fast paced and fun than the novels.
My first Sherlock Holmes book was this collection that recreates the stories as they first appeared in the Strand Magazine. https://www.amazon.com/-/es/Arthur-Conan-Doyle/dp/0890090572/ It's only like $1.30 on Amazon.
Also great is the 100 years of works about Sherlock Holmes to enjoy. Not just adaptations like this one but essays analyzing it and museums.
You mean like Leiningen Versus the Ants by Carl Stephenson or To Build a Fire by Jack London? Can't decide whether they are stories or short novellas.
Some of the Dashiell Hammett short stories and the Raymond Chandler stories are pretty exciting, but I'm not sure about action vs. mystery thrillers. try these
Richmond Noir is what I read before, thinking I'd read the first Macabre.
City of Glass is in fact a standard prose novel. I first read it in the Penguin edition titled <em>The New York Trilogy</em>. City of Glass was later adapted into a graphic novel. I haven't read the graphic novel, so I cannot attest to its quality!
There's always the limited edition gift set for the new series if she doesn't have it already.
One book I like in particular is The Illustrated Sherlock Holmes, which has the stories that were published in The Strand (including Hound of the Baskervilles) and the Paget illustrations that accompanied those stories.
If you're interested in reading some noir, a nice starting point is The Best American Noir of the Century edited by Ellroy and Penzler: http://www.amazon.com/The-Best-American-Noir-Century/dp/0547577443
I absolutely loved all of these short stories, Dashiell Hammett is easily one of my favorite writers.
I just finished this book of short stories.
Although if you're in a fragile mental state, you may be liable to jump after reading too many of these. This shit is bleak.