Ledge

"In a place known as the Ledge, a civilization is trapped by a vast chasm and sheer mountain face. Rations are small, living is tough and there is no way for anyone to escape without befalling a deathly drop. What's more, every season the people must present themselves as a human sacrifice to The Glacians -- mysterious winged creatures who reside beyond the Ledge. Dawsyn, ax wielder and only remaining member of her family, has so far avoided the annual culling, but her luck has run out. She is ripped from her icy home, with no idea what will happen to her on the other side. Enslaved? Murdered? Worse? Fortunately, a half-Glacian called Ryon offers to help them both escape, but how can she trust one of the very creatures that plagued her life? Dawsyn is a survivor, and she is not afraid to cut anyone down to live"--Jacket.