One of You

Ever since I was a little girl, I have remained hidden in the Western Air Temple along with my grandfather, Metok. I've never left. I've never had to. That is, until my grandfather gets word from an old friend that the Avatar had reappeared in the world, and sends me to find him.
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Nyima has always believed that she and her grandfather were the last air benders alive. After all, her grandfather was the sole survivor of the Fire Nation raids a hundred years before. He searched for years to find another, with no luck. Eventually, he gave up.
However, after a mysterious message is sent to her grandfather that the Avatar has returned, Nyima's grandfather sends her out into the world to find him, and bring him home.