I first learned about this book in a review by old friends of mine, the Lateiner Gang.You can see their review here. They pretty much tell you the whole story without spoiling too much.
When I heard about it, the story kind of reminded me of "Wall*E", only without the robots. Basically, it's a sci-fi story that takes place in the future, with people taking off in a big spaceship to colonize a new planet, which is 300 years away from Earth. Certain people, like scientists, military leaders, important people, get cryogenically frozen. Then you have a couple thousand other people to run the ship and help it reach it's destination. Fast-forward a few centuries, and you have a mystery-murderer unplugging certain frozens, one of them a teenage girl. Why?
The love story is okay. It's the sci-fi stuff that was really amazing. All the people who live on the spaceship, centuries after it launches, evolve into a kind of "mono-ethnic" race. Everyone has roughly the same features and traits, so no one is different. Each person has a mini-communicator embedded inside their ear, so you can talk to anyone you want on the ship with a simple vocal command. (I know someone who'd probably think this was ultra-cool. ^_~)
Amazing story. Really compelling. Will definitely leave you thinking after you've closed the book.