One of my favorite all-time fan fics. At first, a Batgirl / Harley pairing just seems odd, but this is so well done that it just makes perfect sense. It's a great love story all around and I probably reread it at least twice a year. The characterization is perfect throughout, and the plot advances in a surprisingly logical manner. My only critisismof the story is it's "Teen" rating. I would have loved more adult content, especially since I am familar with the author's more mature works.
On a personal note - this is the story that introduced me to femslash, Forkanna's stories and ultimately Elsanna. How could I not love it?