On the surface, Riverview High School looks like the post-racial ideal. Serving an enviably affluent, diverse, and liberal district, the school is well-funded, its teachers are well-trained, and many of its students are high achieving. Yet Riverview has not escaped the same unrelenting question that plagues schools throughout America: why is it that even when all of the circumstances seem right, black and Latino students continue to lag behind their peers?

Through five years' worth of interviews and data-gathering at Riverview, John Diamond and Amanda Lewis have created a rich and...