When I was in grad school at Carnegie Mellon University, around 2007-2009, I went to a play audition where the piece they had me reading involved a writer (Russian?) being interrogated by the police because some children have been found murdered in a manner similar to the contents of his stories. The excerpt I read for the audition (I didn't get in) had a story mentioned involving little men made out of apples who either had razor blades inside of them, or wielded razors, with the girl found cut up and posed with, well, little men fashioned out of apples with razor blades. The writer doesn't know who might be doing the killing, and the police are trying to get him to confess by claiming that his brother (mentally disabled?) will be tortured or made the scapegoat if the writer does not confess. I remember it as that the writer was genuinely not certain if someone was doing the killings after being inspired by his books, or if perhaps something has made his stories come true.
I've tried looking at CMU seasons online for 2007-2009, but I don't see anything that matches up with my memories.