In the story, Keeper of the Lost Cities Exile , which is the second book to this series. Sophie is still trying to recover from a life threatening, event that she had to go through. Sophie and her friend Dex were kidnapped, and drugged, etc. That was in the past, Sophie and Dex are back now, but things are different. Everyone thought they were dead before, so Sophie discover's she and her friends special graves that were made when people thought they were gone. Once Sophie comes to understand that and is back home, she connects with something, and after lots of mind connecting she discovers an alicorn, one of the last in the world. As Sophie finally adjusts, and is back to school, she is asked a very important question by her mind coach, Alden. He takes her down to the center of the Earth, which Sophie discoverer's is not as hot as the sun which she had been taught. He tells her they are in the most confidential prison in the world, in the center of the Earth called, Exile. ...