The Abyss and Other Stories by Leonid Andreyev
Andreyev (1871-1919) was one of the leading lights of the so-called Silver Age of Russian lit. He wrote plays, which I have not read, and fiction. After the Communist revolution, he emigrated to Finland, failed to find an audience for his work, and died in obscurity.
I learned about him after his name was used in a NYT crossword, and I subsequently read a few of his novels (The Red Laugh and The Seven Who Were Hanged) and several short story anthologies.
Andreyev uses realism in some stories and fantastic elements in others, and in some stories you'll find both. His central theme is despair, so if you're looking for uplift or a lot of comic touches, look elsewhere.
The Abyss collects 16 stories, including some of his earliest work. The title story has two young lovers walking through the woods, only to encounter a trio of debauched vagrants, who subject them to the most brutal assault conceivable. It's a story from 1902, but it could be the work of a contemporary writer, in that nothing is sweetened.
I found the story 'Lazarus' to be the most original item in the collection. Here, Andreyev imagines the life of Lazarus after his resurrection. Having been days in the tomb, encountering death, he comes back with black, fathomless eyes, which people cannot bear to look into. Those who lock eyes with him lose their zest for life and become obsessed with the futility of existence. The story combines several economical episodes of Lazarus meeting various people (commoners, a sculptor, and finally the Roman emperor) and transforming their lives.
Most readers of Andreyev are probably taking courses in Russian literature, but he is an accessible stylist and his narratives are, besides being dark, dramatic and characterized by distortions of reader expectations.