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 The two main characters are Amy and Elder, and you'll find out when you read this book, that the chapters alternate between the two characters. 
 Amy's mother is a scientist and her father is in the military, and they signed up to be taken aboard Godspeed: a huge spaceship that takes them to Centauri-Earth, a planet 300 years away, where they will build a new world. Amy gets frozen along with her mum and dad while on Earth, so that they will be unfrozen when they reach the new planet. 
 But 50 years before they're supposed to land, Amy is mysteriously unplugged--the victim of an attempted murder--and she can't get refrozen because it might kill her. 
 Elder is a 16-year-old boy who lives on Godspeed. Then there's Eldest, who is the current leader of the ship. He is currently training Elder, who will be the future leader of the ship when Eldest dies. And Harley, Elder's stereotypical best friend, and my favourite character. I really wish I could've seen more of him in this book. 
 Amy and Elder have to find the person who has unplugged Amy, before more and more people will be killed. 
 What I didn't like, is that Amy was kind of conscious when she was frozen, and she came out like nothing happened, even though she was alone with her thoughts for 250 years. It reminded me of Rory Williams in Doctor Who, when he was left as a Centurion for 2,000 years, and he was not the same person anymore after that. Same with Amy Pond in The Girl Who Waited (Doctor Who), she even hated the Doctor after she was left there for 36 years. That was kind of irritating, but not a major problem in the book. 
 I definitely recommend this book to everyone. At first I wasn't sure if I wanted to read it because it's sci-fi, but it turned out to be so different from my expectations. Even if you have never read a science fiction book, or don't like the ones you've read, READ THIS! You can thank me later.