Disclaimer: I have not read any of the Sherlock Holmes stories, so I cannot compare Doyle to himself.
This collection opens with a detailed introduction regarding the publishing history of these stories, which were collected as examples of the non-Sherlock Holmes stories of Doyle's canon. Topics range from a publisher being tricked into publishing local gossip as part of prank by some young people to conflicts surrounding discoveries of wealth, love, and ill-will. Represented here is a wide range of Doyle's work, some of which is mysterious, but not all of it. My favorite will always be The Confession whereby a nun confesses her long-lost love only to see him reappear again. From shipwrecks to South African miners, there's at least one good story in here for you, if you have the time to read it.
These are a bunch of short stories by Arthur Conan Doyle, which don't involve/revolve around his famous sleuth Sherlock Holmes. I've only read the first two: The Mystery of Sasassa Valley and The American's Tale, and they contain plenty of mystery – but without Sherlock Holmes and Dr Watson, they feel a little "empty".
Have read all of Doyle's Sherlock Holmes and probably others as well, just never bothered to put them in to amazon or goodreads, so dates wrong. Some KU some paperback some hardback some collections.