David's life was pretty normal. School. Friends. Actually, the aspect of his life that was the most not-normal had to do with his girlfriend, Senna. Senna was smart. Beautiful. But there was something verydifferent about her. Something strange.

And on the day that it all began, everything happened so quickly. One moment, Senna was with David. Thenext, she was swallowed up by the earth. Her screams echoing from far, far away. David couldn't just let her go like that. Neither could the others.his friends and hers. So, they followed her and found themselves in a world they never could have imagined.

Now they have to find Senna and get home without losing their lives.Or their minds.Or both.