Alayna. A Lycan, which appears to be a supernatural werewolf/shapeshifter (she is not affected by the phase of the moon, but can change form at will). Tremendously strong and gifted with regenerative powers.
Her sister was murdered and a Moonstone stolen. The significance of the Moonstone is not yet known to us, but is obviously of great importance to Nara's family and perhaps to the Lycans in general. Nara's father has sent her out to retrieve it and to solve the mystery of her sister's death.