At 4 a.m., you’re in a Miami-Dade County police station trying to pry answers out of a tight-lipped rookie officer as you await your estranged husband, who not so long ago moved out and moved on. The intricate, incendiary issues of race add another layer to the mounting tension: You are black; your ex is white; your missing son, Jamal, is biracial – his whereabouts something the young white cop can’t, or won’t, reveal.