Different in an Unconventional Way

As long as she had been alive, Katie had always known that she was different. Different from her family, and different from the rest of the planet.

And not different in the quirky, conventional way (although, that she was as well). No, Katie Holt was different in quite an unconventional way.

You see, Katie Holt wasn't Katie Holt at all. No, she was perhaps the last of a nearly extinct alien race. An alien race known as the Alteans.