In 2001, a 10- and 3-year-old went missing in Chicago—a case that's since become complicated by time, trauma, and relations between law enforcement and the Black community.

The note sat on the back of Tracey Bradley's couch when she returned home from work late that morning. Written by her 10-year-old daughter, Tionda, the note said she and Diamond, her 3-year-old sister, had run by the store and to a park on Chicago’s South Side.