This is an intriguing start, and you have certainly captured my attention with the mysterious book Mallory has found. I was wondering about the handsome man, and the hoof, and then remembered the title, so I'm thinking he must be a Centaur, which is certainly an original love interest.
The use of the name 'Ginny' has obviously made me think of Ginny Weasley/Potter, although I'm thinking this must be a conincidence as you've described her as having green eyes, and Ginny in the books had brown. Perhaps she's a relation, somehow.
As a prologue this certainly captures the attention, although I wish it had been a bit longer, and also that you'd added to the story because I can see it's been over a year since you updated.
Good start. Well done. ~Carole~
I like this so far, looking forward to the next chapter!