THE LIGHTS GO ON AGAIN

A third book about an English brother and sister evacuated to Canada in 1940. The Sky Is Falling (1989) and its sequel focused on Norah and her uneasy relationship with wealthy ``Aunt Florence,'' who took them in. Now, in 1945, the central character is Gavin, five years younger. Still mourning the child she lost long ago, Aunt Florence has indulged Gavin with more generosity than wisdom (he's ten, but she still calls him ``sweetness''); when his Mum and Dad are killed, she hopes to adopt him. Loving Canada and Aunt Florence, unable to remember England or his parents, Gavin is eager to accept, even though he would be parted from Norah when she goes home. But when Grandad turns up after the war to sort things out and Gavin also finds a long-lost toy from home, some memories return and he changes his mind. Gavin, mostly unspoiled despite Aunt Florence's pampering, is well realized here, but other characterizations depend largely on the earlier books. Still, Gavin's complicated feelings are conveyed with insight, and readers will enjoy learning ``what happened next.'' (Fiction. 10-14)