Day 13 → A fictional book

I'm going to assume the creators of this meme mean "a book of fiction" and not a make-believe book. Well, we already covered my favorite book of all time, so now I'll list my favorite book in fantasy/science fiction genre. Golden Witchbreed by Mary Gentle. Oddly, I've read other books by her, and haven't really liked any of them, with the sequel to Golden Witchbreed ranking as one of my most hated books of all time. But she got absolutely everything right in Golden Witchbreed. Characters, world, plot, her style and language... everything about this book just blows me away. I might even re-read it more frequently than I do The Secret Ways. I own multiple copies and have one right here at my desk, in easy reach. Great book.