In the world of children's literature, Louise Fitzhugh's Harriet the Spy and The Long Secret are widely recognized as epoch-making. They have been received by young readers, year after year, with excitement and love. The new Fitzhugh novel shares the vigorous sense of comedy and the unflinching fidelity to the real world that distinguished her earlier books. Many readers will feel, however, that Nobody's Family Is Going to Change is even finer than...