Helicopters patrolled low over the city, filming blocks of burning cars and buildings, mobs breaking into storefronts, and the vicious beating of truck driver Reginald Denny. For a week in April 1992, Los Angeles transformed into a cityscape of rage, purportedly due to the exoneration of four policemen who had beaten Rodney King. It should be no surprise that such intense anger erupted from something deeper than a single incident.

In The Contested Murder of Latasha Harlins, Brenda Stevenson tells the dramatic story of an earlier trial, a turning point on the road to the 1992...