"Downhill Slide," by Jeff Howe, in Moon Shot, edited by J. Alan Hartman, Untreed Books, 2013.
This book is a collection of science fiction mysteries (which gives me a chance to write about genre crossovers next Wednesday at SleuthSayers). One frequent complaint about combining these two fields is that you can't write a fairplay mystery in a science fiction world, because the reader can't know enough about the environment. This is a fairplay story, of sorts, and you will have to decide whether it follows the rules.
At first the plot sounds like one of those gook luck/bad luck jokes.
A miner gets killed on an asteroid, and that's bad.
But someone confessed, and that's good.
Except it turns out that the confessed killer couldn't have done it, and that's bad.
However, a detective is heading to the scene of the crime to interview the other suspects, and that's good.
But there aren't any other suspects. No one else on the whole asteroid. And that's -- well, that stinks.
There are some lovely twists in this story, including one that I seem to remember from a science fiction movie of a few years back. But to be fair (there's that word again) I still didn't see it coming.