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.

Norah, an English "war guest" living with the wealthy Ogilvie family in Toronto, can hardly wait for August. She'll spend it at the Ogilvie's lavish cottage in Muskoka—a whole month of freedom, swimming, adventures with her "cousins"... But this isn't an ordinary summer. It's 1943, and the war is still going on. Sometimes Norah can't even remember what her parents look like—she hasn't seen them in three years. And she has turned thirteen, which means life seems to be getting more complicated. Then a distant Ogilvie cousin, Andrew, arrives. He is nineteen, handsome, intelligent, and Norah thinks she may be falling in love for the first time. But Andrew has his own problems: he doesn't want to fight in the war, and yet he knows it's what his family and friends expect of him. What the two of them learn from each other makes for a gentle, moving story, the second book in a trilogy that began with the award-winning The Sky Is Falling.

For five years Gavin and his sister Norah have lived in Canada as "war guests." But now, as 1945 approaches, the war is finally ending, and Gavin and Norah will soon be going back to England Norah, who's fifteen, is eager to see her parents again, but ten-year-old Gavin barely remembers them. He doesn't want to leave his Canadian family, his two best friends and his dog. Then something happens that forces Gavin to make the most difficult decision of his life. The Lights Go On Again is the last book in the acclaimed series that began with The Sky Is Falling and Looking At The Moon.