"Federico and Lourenço are brothers. Their father is black, a famed forensic pathologist for the police; their mother is white. Federico--distant, angry, analytical--has light skin, which means he's always been able to avoid the worst of the racism Brazilian culture has to offer. He can "pass" as white, and yet, because of this, he has devoted his life to racial justice. Lourenço, on the other hand, is dark-skinned, easygoing, and well-liked in...