Gr 2-3 The Carricks have added a welcome chapter to the story of their small protagonist's travels through the perils of childhood. Christopher, returning with his class on a subway from a visit to a city aquarium, is separated from his partner and left alone at a strange stop. Luckily, a security man notices him and turns him over to the police, who see that he is soon reunited with his teacher. (One false note here is that Christopher's class appears to be supervised by only one adulta highly unlikely circumstance in real life). This picture book explores the fear of abandonment, one of children's strongest fears, in a matter-of-fact text that tells the story without scary dramatics, and in satisfying pictures in soft, light colors that lighten the atmosphere of the institutional settings. This book is sure to generate a waiting list. Ruth Semrau, Lovejoy School, McKinney, Tex.