I'll start off by saying that it's the quality of the story itself that brings my rating up to three stars, otherwise, it probably would have been nearer to two. There were quite a few choppy paragraphs and poorly structured sentences, and some of the conversations weren't laid out too well - I had to reread some parts several times in order to figure out who was saying what.
Those flaws aside, as I said already, the story itself was good. It was fast paced, and it seemed to be pretty well thought out. I read it in a matter of hours. I really didn't see the plot twist towards the end coming until about 2/3 of the way through, so that was a pleasant surprise; a lot of novellas give away the ending too early.
If you're looking for a quick, easy, entertaining read, I think this is worth checking out.