Why would a child murder another child? What makes a Mary Bell? Is it heredity, pathology or environment? Should we regard her as monster, victim, or both? Gitta Sereny"s groundbreaking book was the first for a broad readership to address the subject of children who kill. Now the debate has, tragically, re-opened and her findings are once again of urgent importance. This edition contains a new preface by the author, as well as her account of the death of James Bulger.