All André Norton's old skills are here [in Iron Cage], but they are here used to make explicit a theme, the important potential of animals, which has been implicit in many of her books from the beginning. Jony, of human origin, who has been nurtured on an alien planet by creatures of about stone-age intelligence who have developed from bears, throws in his lot with them and defeats the attempts of visiting men to colonise what has become to him his home planet. Some adult readers will share—and perhaps be surprised to share—my shock at a human being's choosing to bring disaster on an expedition of morally quite normal men; but few will deplore a plea for greater concern for and understanding of animals.

Young readers will need a certain amount of sophistication to link satisfactorily the Prologue and Epilogue in which a cat is dumped...