Book — Rachel Vincent

For as long as sixteen-year-old Adele can remember, the village of Oakvale has been surrounded by the dark wood—a forest filled with terrible monsters. A forest that light itself cannot penetrate.
Unlike her fellow villagers, Adele cannot avoid the dark wood.
Adele is one of a long line of guardians: women who secretly take on the form of a wolf, in order to protect their village.
But when accepting her fate means giving up the boy she loves, abandoning the future she imagined for herself, and breaking her own moral code, she must decide how far she is willing to go to keep her neighbors safe.