Catherine loved it.
Here's the summary from Amazon:
His name is West. Her name is Cally. They speak different languages and come from different countries thousands of miles apart, but they do not know that. What they do know are the tragedies that took their parents, then wrenched the two of them out of reality, into a strange and perilous world through which they must travel together, knowing only that they must reach the sea. Together West and Cally embark upon a strange and sometimes terrifying quest, learning to survive and to love and, at last, the real secret of their journey.