Peter S. Beagle's The Last Unicorn
So basically this is one of my all time top five favorite books, though I was spurred to reread it this time after using it this weekend in a game of Bring Your Own Book. I'm super psyched that it's on Kindle now, and the Deluxe Edition comes with the sequel novella, Two Hearts (which makes me straight up weep), so I definitely recommend that version! It's funny to read this now, at the age Molly Grue is in the novel--is that why I now think she is by far the best character? Especially considering this was written in the 1960s! It's totally timeless.