Parasite by Mira Grant is a crossover between a medical thriller and science-fiction, and by science fiction I mean fiction based on science, not a fairy-tale happening in a galaxy far, far away.
The premise is original and rather audacious, but presented in a believable way, thanks to just the right amount of scientific background, gracefully served in small, unobtrusive bits of information. The action is reasonable paced, with sudden twists interlaced with slower parts, comprised mostly of protagonist's inner monologues. The plot is interestingly spiced up by a chilling motif of a mysterious children's book, quotations from which keep appearing throughout the story.
The writing itself is good, but in the audio version it's taken to a whole new level due to spectacular narration by Christine Lakin. I sincerely don't know if I would enjoy this book as much as I did, if it wasn't read in such a fantastic way.
I can recommend “Parasite” to everyone, especially in the audio version. Even if you don’t appreciate the plot, you will surely enjoy the atmospheric writing and excellent voice acting.