The Sky Is Falling — Kit Pearson

It is the summer of 1940, and all of England fears an invasion by Hitler's army. Norah lies in bed listening to the anxious voices of her parents downstairs.
Then Norah is told that she and her brother, Gavin, are being sent to Canada. The voyage across the ocean is exciting, but at the end of it Norah is miserable. The rich woman who takes them in prefers Gavin to her, the children at school taunt her, and as the news from England becomes worse, she longs for home.

As Norah begins to make friends, she discovers a surprising responsibility that helps her to accept her new country.